Originally Posted by Will-i-am718

I’ve been really enjoying reading this whole thread. I have a 2022 Cayman GTS 4.0 MT which as of 6/14 has the SoulP resonated oap & BMC air filters. And on 6/17, the CG valve controller unit & the SS delete were done. I think it sounds a little deeper & throatier now with no additional bothersome drone in all rpm ranges with both VO & VC settings—granted these were all just minor changes but cumulatively, it seems to have made a significant difference. But, I feel like i need a little more volume. I’m considering adding the SoulP valved exhaust muffler which sounds great on Matt M’s YT review. Question: At this juncture, what other back boxes should i even consider? Kline (won’t fit the SoulP due to Kline’s proprietary system), Cargraphics (quality exhausts made in Germany but confusing 4 muffler options & not sure if the sound will be as robust as SoulP & JCR, or JCR (great motorsport sound but worried about fitment & also titanium’s potential for cracking since i plan to track it someday in the future). Or should i just stick with the SoulP back-box add-on? At the end of the warranty period, i will consider street headers & an ECU tune if that helps. Thanks gentlemen! Hope i didn’t go off on a tangent here.

Originally Posted by Will-i-am718

I’ve been really enjoying reading this whole thread. I have a 2022 Cayman GTS 4.0 MT which as of 6/14 has the SoulP resonated oap & BMC air filters. And on 6/17, the CG valve controller unit & the SS delete were done. I think it sounds a little deeper & throatier now with no additional bothersome drone in all rpm ranges with both VO & VC settings—granted these were all just minor changes but cumulatively, it seems to have made a significant difference. But, I feel like i need a little more volume. I’m considering adding the SoulP valved exhaust muffler which sounds great on Matt M’s YT review. Question: At this juncture, what other back boxes should i even consider? Kline (won’t fit the SoulP due to Kline’s proprietary system), Cargraphics (quality exhausts made in Germany but confusing 4 muffler options & not sure if the sound will be as robust as SoulP & JCR, or JCR (great motorsport sound but worried about fitment & also titanium’s potential for cracking since i plan to track it someday in the future). Or should i just stick with the SoulP back-box add-on? At the end of the warranty period, i will consider street headers & an ECU tune if that helps. Thanks gentlemen! Hope i didn’t go off on a tangent here.

Originally Posted by Will-i-am718

I’ve been really enjoying reading this whole thread. I have a 2022 Cayman GTS 4.0 MT which as of 6/14 has the SoulP resonated oap & BMC air filters. And on 6/17, the CG valve controller unit & the SS delete were done. I think it sounds a little deeper & throatier now with no additional bothersome drone in all rpm ranges with both VO & VC settings—granted these were all just minor changes but cumulatively, it seems to have made a significant difference. But, I feel like i need a little more volume. I’m considering adding the SoulP valved exhaust muffler which sounds great on Matt M’s YT review. Question: At this juncture, what other back boxes should i even consider? Kline (won’t fit the SoulP due to Kline’s proprietary system), Cargraphics (quality exhausts made in Germany but confusing 4 muffler options & not sure if the sound will be as robust as SoulP & JCR, or JCR (great motorsport sound but worried about fitment & also titanium’s potential for cracking since i plan to track it someday in the future). Or should i just stick with the SoulP back-box add-on? At the end of the warranty period, i will consider street headers & an ECU tune if that helps. Thanks gentlemen! Hope i didn’t go off on a tangent here.

Originally Posted by IL_Pete

Yes, I agree. I did play with it some more, it does (as I recall from last year in the Cayman GTS 4.0) help both in low rpm tooling around when you want to turn it down a couple of notches, and for highway cruising in 5th or 6th under 3800 RPM. As you say, significantly louder than stock with valves closed, but still quieter than the JCR+OAP setup with valves open.

So a further update here - I did get the Soul Resonated OAPs installed, and the BMC Air Filters. I have to say, I am SHOCKED by the difference!

To refresh on the history here, I had the Cargraphic High Flow Filter OAPs, which to me were a great compromise / Goldilocks in between solution between the JCR Silenced Valve Exhaust and the Stock OAPs, and the JCR Exhaust with Wide-Open Soul OAPs, with regards to (1) volume, (2) bassiness in the cabin of a Cayman (not as much of an issue with the Boxster this year) and (3) power increase. The JCR with Stock OAPs was too quiet and lost a lot of power versus with Wide-Open OAPs, but had minimal bassiness in the cabin in the Cayman. With the Wide-Open OAPs, it was a little too loud for my tastes, but still not really that loud, if you compare to Headers for instance. I am bit sensitive to volume as (1) I don't want to be too obnoxious out there when driving in a spirited fashion and (2) I have an issue with a bad left ear that gets easily bothered by too much noise. The power was awesome, but with the Cayman there was too much Bassiness in the Cabin, it was too much for me in the daily driving around town where it is tougher to keep it out of the troubled RPM ranges. With the CG HFF OAPs, it was really great in the Cayman, I got a good portion of the power increase back, the volume was good, and the bassiness was livable.

When I got the Boxster and installed the same setup, I felt it was a little quiet for when the top is down, thus the desire to experiment some more. I figured that perhaps the Resonated Soul OAPs would be another good in between solution between JCR and Stock OAPs and JCR with Wide-Open OAPs like the CG HFF, but perhaps a little more towards the JCR with Wide-Open OAPs. But I wasn't sure, I was concerned that maybe it wouldn't be too much of a difference. Now of course I changed two things at once (to Soul Resonated OAPs and the BMC Air Filters), so when you do that you can't be 100% certain how much of the change was due to which one of the items changed.

I wasn't expecting much change from the Air Filters, so I was focused on how the OAPs would change it. The result was a SIGNIFICANT change, in tone, volume and power. Overall, the volume increased at all throttle and RPM levels. The sound under heavier throttle became much more aggressive, throatier, raspier (in a good way) and more Motorsport. The feel of the power increase a lot. Hard pulls were significantly more aggressive - I saw and felt the traction control kicking in a LOT more at high/full throttle in 1st and 2nd gear.

It almost seemed to me to have more power and more aggressive sound than the JCR with the Wide-Open OAPs last year in the Cayman. Tough to tell exactly, that was a long time ago, and also the cars react to the exhaust mods a little differently. That leads me to believe that perhaps the Air Filters do make a difference, maybe particularly when you open everything up with a freer flowing exhaust and OAPs.

The car is beastly now when pushed hard. So much so that you do get a bit of a feeling that you are overwhelming the chassis. More so than I ever felt in the Cayman - perhaps at those high levels of chassis stress I am feeling the difference in body stiffness between a Boxster GTS and a Cayman GTS. It doesn't feel bad, you are just conscious that you are pushing the chassis to the limits, that makes me think that you probably wouldn't want much more HP/Torque without going to a Spyder or a GT4.

The volume level for spirited country road driving is a little high for my sensitive left ear. I may have to wear an earplug for that. But also it does pretty much resolve the issue where the exhaust with the previous setup sounded a little too muffled with both windows up with the top down. It still does get just a slight bit muffled still, but MUCH less so, it is to me much more pleasant with the top down and both windows up.

Overall I am pretty happy with how this turned out. The only caveat to that is the volume and frequencies now being above the threshold where my bad left ear gets bothered. (My ear was doing better, it did get aggravated again separately from the driving by my dog barking right into my ear a couple of weeks ago, so it is tough to tell if it is just from the exhaust, or if it is more sensitive in general now.)

I can't comment on how the bassiness is with the Soul Resonated OAPs with the JCR, as it is not as much present in a Boxster versus the Cayman last year (it was pretty unbearable with the JCR + Wide-Open OAPs in the Cayman). I haven't experimented with the top up in the Boxster yet to see if I can detect a difference in that, I will try that soon. But overall it sounds great, more aggressive, and the butt dyno says a good boost in power with the combination of the Soul Resonated OAPs and the BMC Air Filters.

I do suspect that the Air Filters have a positive impact on tone/sound and power - I would recommend that very highly as a complement to exhaust and OAP mods.

Originally Posted by IL_Pete

Yes, I agree. I did play with it some more, it does (as I recall from last year in the Cayman GTS 4.0) help both in low rpm tooling around when you want to turn it down a couple of notches, and for highway cruising in 5th or 6th under 3800 RPM. As you say, significantly louder than stock with valves closed, but still quieter than the JCR+OAP setup with valves open.

So a further update here - I did get the Soul Resonated OAPs installed, and the BMC Air Filters.
I have to say, I am SHOCKED by the difference!

To refresh on the history here, I had the Cargraphic High Flow Filter OAPs, which to me were a great compromise / Goldilocks in between solution between the JCR Silenced Valve Exhaust and the Stock OAPs, and the JCR Exhaust with Wide-Open Soul OAPs, with regards to (1) volume, (2) bassiness in the cabin of a Cayman (not as much of an issue with the Boxster this year) and (3) power increase. The JCR with Stock OAPs was too quiet and lost a lot of power versus with Wide-Open OAPs, but had minimal bassiness in the cabin in the Cayman. With the Wide-Open OAPs, it was a little too loud for my tastes, but still not really that loud, if you compare to Headers for instance. I am bit sensitive to volume as (1) I don't want to be too obnoxious out there when driving in a spirited fashion and (2) I have an issue with a bad left ear that gets easily bothered by too much noise. The power was awesome, but with the Cayman there was too much Bassiness in the Cabin, it was too much for me in the daily driving around town where it is tougher to keep it out of the troubled RPM ranges. With the CG HFF OAPs, it was really great in the Cayman, I got a good portion of the power increase back, the volume was good, and the bassiness was livable.

When I got the Boxster and installed the same setup, I felt it was a little quiet for when the top is down, thus the desire to experiment some more. I figured that perhaps the Resonated Soul OAPs would be another good in between solution between JCR and Stock OAPs and JCR with Wide-Open OAPs like the CG HFF, but perhaps a little more towards the JCR with Wide-Open OAPs. But I wasn't sure, I was concerned that maybe it wouldn't be too much of a difference. Now of course I changed two things at once (to Soul Resonated OAPs and the BMC Air Filters), so when you do that you can't be 100% certain how much of the change was due to which one of the items changed.

I wasn't expecting much change from the Air Filters, so I was focused on how the OAPs would change it.
The result was a SIGNIFICANT change, in tone, volume and power.
Overall, the volume increased at all throttle and RPM levels.
The sound under heavier throttle became much more aggressive, throatier, raspier (in a good way) and more Motorsport.
The feel of the power increase a lot.
Hard pulls were significantly more aggressive - I saw and felt the traction control kicking in a LOT more at high/full throttle in 1st and 2nd gear.

It almost seemed to me to have more power and more aggressive sound than the JCR with the Wide-Open OAPs last year in the Cayman. Tough to tell exactly, that was a long time ago, and also the cars react to the exhaust mods a little differently. That leads me to believe that perhaps the Air Filters do make a difference, maybe particularly when you open everything up with a freer flowing exhaust and OAPs.

The car is beastly now when pushed hard. So much so that you do get a bit of a feeling that you are overwhelming the chassis. More so than I ever felt in the Cayman - perhaps at those high levels of chassis stress I am feeling the difference in body stiffness between a Boxster GTS and a Cayman GTS. It doesn't feel bad, you are just conscious that you are pushing the chassis to the limits, that makes me think that you probably wouldn't want much more HP/Torque without going to a Spyder or a GT4.

The volume level for spirited country road driving is a little high for my sensitive left ear. I may have to wear an earplug for that. But also it does pretty much resolve the issue where the exhaust with the previous setup sounded a little too muffled with both windows up with the top down. It still does get just a slight bit muffled still, but MUCH less so, it is to me much more pleasant with the top down and both windows up.

Overall I am pretty happy with how this turned out. The only caveat to that is the volume and frequencies now being above the threshold where my bad left ear gets bothered. (My ear was doing better, it did get aggravated again separately from the driving by my dog barking right into my ear a couple of weeks ago, so it is tough to tell if it is just from the exhaust, or if it is more sensitive in general now.)

I can't comment on how the bassiness is with the Soul Resonated OAPs with the JCR, as it is not as much present in a Boxster versus the Cayman last year (it was pretty unbearable with the JCR + Wide-Open OAPs in the Cayman). I haven't experimented with the top up in the Boxster yet to see if I can detect a difference in that, I will try that soon. But overall it sounds great, more aggressive, and the butt dyno says a good boost in power with the combination of the Soul Resonated OAPs and the BMC Air Filters.

I do suspect that the Air Filters have a positive impact on tone/sound and power - I would recommend that very highly as a complement to exhaust and OAP mods.

Originally Posted by tigerhonaker

Pete,

A Very-very interesting post ..............

Thanks for the information regarding the addition of the BMC Performance Air Filters.
I'm soon having the following installed on my 2021 Cayman 718 GT4 at PON (Porsche of Nashville).
July 5th, 2022 7:30 am.

(1) SOUL OAP with the optional Jet-Hot 1300 degree ceramic coating.

(2) Cargraphics valve controller Mode 2.

(3) And now I'm STRONGLY considering also immediately ordering the BMC Performance Air Filters.
The above is based on your above Post that I just BOLDED with your comments regarding the BMC filters.
Do you have any further comments you can share with me on the BMC Performance Air Filters ???
I'm getting ready to place the order so hopefully you'll see this Post before I place that order.

Thanks,
Terry

Originally Posted by tigerhonaker

Pete,

A Very-very interesting post ..............

Thanks for the information regarding the addition of the BMC Performance Air Filters.
I'm soon having the following installed on my 2021 Cayman 718 GT4 at PON (Porsche of Nashville).
July 5th, 2022 7:30 am.

(1) SOUL OAP with the optional Jet-Hot 1300 degree ceramic coating.

(2) Cargraphics valve controller Mode 2.

(3) And now I'm STRONGLY considering also immediately ordering the BMC Performance Air Filters.
The above is based on your above Post that I just BOLDED with your comments regarding the BMC filters.
Do you have any further comments you can share with me on the BMC Performance Air Filters ???
I'm getting ready to place the order so hopefully you'll see this Post before I place that order.

Thanks,
Terry

Originally Posted by IL_Pete

Hey Terry!

As I said - it is tough to tell for sure, as I did two things at once. But I am suspecting that the Air Filters might be contributing to some of the awesome sound at high RPMs and heavy throttle, I base that on my memory of sounds from previous combinations of exhaust and wide open OAPs with the Cayman last year.

They are not expensive, so I say go for it!

-Pete

Originally Posted by incursion

I love your updates @IL_Pete and have one of my own. I heard the JCR race pipe in a GT4 last weekend and thought it sounded pretty good, especially from the outside. Just as a reminder, here's what I've heard thus far: JCR valved in a GT4, Kline stainless in a Spyder, Soul race pipe in a Spyder, full Kline Inconel system, including headers in a GTS 4.0. I still like @flynlo 's Kline Stainless in his Spyder the best. Personally, I think the JCR is overrated. If you want a very refined sound, then I'd say get the JCR, but if you're looking for more of a growl, the Kline is better, imho. I also think I prefer the Soul race pipe over the JCR race pipe from the inside, but it's not an apples-to-apples comparison since I heard the Soul race pipe in a Spyder and the JCR race pipe in a GT4. I would not daily the Soul or JCR race pipes because the drone is pretty bad in the 2k-3k range.

Originally Posted by Alpha Ice

I'd argue that with a JCR system the drone doesn't exist above 2600 rpms...but everyone's ears are different. I also happen to have the full manifolds, superlight system that is catted with silencer's and other than the noise from cold start I do drive mine a few times a week happily. Keeping it above that range and having the extra power to not have to go as hard on the throttle to climb the hills when you do find yourself going 55 in 6th makes it easier. I also did a 12 hour trip and driving reasonably on the highway I averaged 29 mpg over 700 some odd miles. I could have not done my several 100 mph passing runs, and driven in 5th for most of the back roads and still pulled down something in the 26s no doubt. There are always options, but I do find the refined and enjoyable sound of the JCR the best in the business. My friend had a Soul Race setup and the drone was awful in it according to him, he didn't keep it long.

Originally Posted by IL_Pete

Hey Terry!

As I said - it is tough to tell for sure, as I did two things at once. But I am suspecting that the Air Filters might be contributing to some of the awesome sound at high RPMs and heavy throttle, I base that on my memory of sounds from previous combinations of exhaust and wide open OAPs with the Cayman last year.

They are not expensive, so I say go for it!

-Pete

Originally Posted by IL_Pete

Hey Terry!

As I said - it is tough to tell for sure, as I did two things at once. But I am suspecting that the Air Filters might be contributing to some of the awesome sound at high RPMs and heavy throttle, I base that on my memory of sounds from previous combinations of exhaust and wide open OAPs with the Cayman last year.

They are not expensive, so I say go for it!

-Pete

Originally Posted by incursion

Someone else has mentioned this before on this forum as well regarding the air filters and noise.