GT4 and Spyder RS Aftermarket Exhausts
07-23-2023, 09:27 PM
#16
Rennlist Member
My first priority is I want a GT3 cup car type sound similar to what JCR achieved on the GT4. Second priority is no drone or small amount that you can easily avoid a certain RPM range. Third priority is reusing the stock Weissach tips because they're beautiful. Fourth priority is I don't want it to be insanely loud where it overpowers the unique intake sound completely.
It's too early to judge to see who has achieved #1 and #2 above since almost no sets have been delivered to real customers. For #3 it seems like Fabspeed and Kline are the only ones allowing that so far?
So far I've ordered Fabspeed OAP's because they're the only ones that are decently affordable($2200 - 15% discount code) with heat shielding. I should have them installed in the next few weeks but I'm assuming it will just increase stock volume by 20-30% similar to what OAP's do on the GT4/Spyder.
It's too early to judge to see who has achieved #1 and #2 above since almost no sets have been delivered to real customers. For #3 it seems like Fabspeed and Kline are the only ones allowing that so far?
So far I've ordered Fabspeed OAP's because they're the only ones that are decently affordable($2200 - 15% discount code) with heat shielding. I should have them installed in the next few weeks but I'm assuming it will just increase stock volume by 20-30% similar to what OAP's do on the GT4/Spyder.
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07-23-2023, 10:00 PM
#17
My first priority is I want a GT3 cup car type sound similar to what JCR achieved on the GT4. Second priority is no drone or small amount that you can easily avoid a certain RPM range. Third priority is reusing the stock Weissach tips because they're beautiful. Fourth priority is I don't want it to be insanely loud where it overpowers the unique intake sound completely.
It's too early to judge to see who has achieved #1 and #2 above since almost no sets have been delivered to real customers. For #3 it seems like Fabspeed and Kline are the only ones allowing that so far?
So far I've ordered Fabspeed OAP's because they're the only ones that are decently affordable($2200 - 15% discount code) with heat shielding. I should have them installed in the next few weeks but I'm assuming it will just increase stock volume by 20-30% similar to what OAP's do on the GT4/Spyder.
It's too early to judge to see who has achieved #1 and #2 above since almost no sets have been delivered to real customers. For #3 it seems like Fabspeed and Kline are the only ones allowing that so far?
So far I've ordered Fabspeed OAP's because they're the only ones that are decently affordable($2200 - 15% discount code) with heat shielding. I should have them installed in the next few weeks but I'm assuming it will just increase stock volume by 20-30% similar to what OAP's do on the GT4/Spyder.
From what I have learned on the GT4 and GT4RS, getting the GT3/Cup car sound will be almost impossible, you will be able to get close but that will come with drone for sure and that's' your #2 priority, no drone. So for those two things to work you will need a rear section with a real muffler, not a resonator(s) and no dumping of each bank individually. This also affects your #4 priority...it order to keep volume at sane levels you need a muffler and valves. On you #3 priority ,the reason some manufacturers are not using the WP tips is because of the flow restrictions of stepping down the tubing on the rear section, these cars need 3" tubing and the OEM muffler is 2.25", it's the same muffler as on the GT4 and on those a muffler change did provide a bump in power so on the 4RS it will be more. Those keeping the same tubing diameter as OEM tells a lot about how much R&D they do for these cars. Excluding pricing, which can be a hot topic, Dundon setup might get you close. The SOUL setup is amore economical and their rear valved muffler does sound very good even with valves close, with minimal drone....but it's not GT3/Cup sound. Would be interesting to hear the Klein system and if you are Ok with not maximizing power gains this might be the ticket for you.
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07-23-2023, 10:13 PM
#18
Im torn on this one. I've never listened to my GT4rs from the outside. I probably never will! And it sounds so damn good from inside! 30-50 extra HP and I'm in. But for it to sound "better" to others outside of the car.... 🤷
07-23-2023, 10:15 PM
#19
Rennlist Member
From what I have learned on the GT4 and GT4RS, getting the GT3/Cup car sound will be almost impossible, you will be able to get close but that will come with drone for sure and that's' your #2 priority, no drone. So for those two things to work you will need a rear section with a real muffler, not a resonator(s) and no dumping of each bank individually. This also affects your #4 priority...it order to keep volume at sane levels you need a muffler and valves. On you #3 priority ,the reason some manufacturers are not using the WP tips is because of the flow restrictions of stepping down the tubing on the rear section, these cars need 3" tubing and the OEM muffler is 2.25", it's the same muffler as on the GT4 and on those a muffler change did provide a bump in power so on the 4RS it will be more. Those keeping the same tubing diameter as OEM tells a lot about how much R&D they do for these cars. Excluding pricing, which can be a hot topic, Dundon setup might get you close. The SOUL setup is amore economical and their rear valved muffler does sound very good even with valves close, with minimal drone....but it's not GT3/Cup sound. Would be interesting to hear the Klein system and if you are Ok with not maximizing power gains this might be the ticket for you.
I will admit most of the exhaust brands for the 4RS are taking longer R&D and putting more thought into the rear sections. Both Soul and Fabspeed have X Pipes and Hemholtz Resonators trying to get that cleaner high pitch sound. I'm in SoCal so I'll end up hearing most of the setups in the next 6months I bet since we have so many 4RS's here already.
07-23-2023, 10:21 PM
#20
Sound on the outside is not that great thanks to the awful OEM muffler...had the same problem on the GT4
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07-23-2023, 10:36 PM
#21
Not impossible, I achieved that sound with Flat6 OAP's and JCR rear silenced valved section on my Spyder with very minimal drone(easy to stay out of 2300rpm where the drone happened). Sounded way better than Soul/Kline/etc. I think the 3" tubing is overblown and is marketing "hype" by the brands who are using it, there's dyno's from those brands showing just rear section gains and they're very minimal. Most of the power gains are coming from either removing the OAP's which have the OPF's or headers with smaller cats/re-routing them.
I will admit most of the exhaust brands for the 4RS are taking longer R&D and putting more thought into the rear sections. Both Soul and Fabspeed have X Pipes and Hemholtz Resonators trying to get that cleaner high pitch sound. I'm in SoCal so I'll end up hearing most of the setups in the next 6months I bet since we have so many 4RS's here already.
I will admit most of the exhaust brands for the 4RS are taking longer R&D and putting more thought into the rear sections. Both Soul and Fabspeed have X Pipes and Hemholtz Resonators trying to get that cleaner high pitch sound. I'm in SoCal so I'll end up hearing most of the setups in the next 6months I bet since we have so many 4RS's here already.
And that 2300 drone you talk about....on the GT4RS/SRS you will live in that range with less insulation and more sounds coming into the cabin...unless you pick your gears and keep it above 3K rpm.
I also wouldn't discount the 3" tubing as Hype....there's more than enough evidence of that on the GT4 and now on the GT4RS. Some GT4's picked +10 hp at the wheels with a muffler change, the 4RS should at least match that.
All the data on 991/992 GT3/RS exhaust point to 3" tubing...we have the same engine with longer exhaust route so it also applies here...but if Weissach tips are a Priority then go for the smaller tuning.
I personally have the Soul street header package and their valved muffler...very close to GT3 sound but it still has that particular character that's unique to the mid engine platform. But very happy with the results so far...unfortunately had to give up on the Weissach tips.
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07-23-2023, 11:05 PM
#22
Racer
I would wait for feedback...what works on the 718 GT4 may not be the same on the GT4RS. If the drone was a problem on the GT4 the GT4RS has more plus you have intake sound, less insulation, different engine, etc.
Most headers/OAP with cats are similar to what Dundon did on the GT4 and this design is the best solution for the 4RS
IMHO I think Soul put a LOT of R&D on their setups and were some of the first to have different systems.
Dundon should be good but very expensive, specially if you add the still pending rear muffler.
JCR is basically following what they did on the GT4
Fabspeed? Not so sure on those....will reserve my opinion on that one.
Still waiting on Cargraphics.
Kline is a good option is you are looking for sound...don't like their header design.
Akra is a mixed bag...their OAP are a good product and a great price, headers like those above? Not sure but they do look pretty and probably expensive..rear muffler? Hate their sound and design...is like the OEM but amplified and way too expensive.
Before you jump into something take a look at the design, how much R&D the company did, any feedback from manufacturer and users.
Some of the stuff out there is just to please people but I doubt it delivers the goods.
Most headers/OAP with cats are similar to what Dundon did on the GT4 and this design is the best solution for the 4RS
IMHO I think Soul put a LOT of R&D on their setups and were some of the first to have different systems.
Dundon should be good but very expensive, specially if you add the still pending rear muffler.
JCR is basically following what they did on the GT4
Fabspeed? Not so sure on those....will reserve my opinion on that one.
Still waiting on Cargraphics.
Kline is a good option is you are looking for sound...don't like their header design.
Akra is a mixed bag...their OAP are a good product and a great price, headers like those above? Not sure but they do look pretty and probably expensive..rear muffler? Hate their sound and design...is like the OEM but amplified and way too expensive.
Before you jump into something take a look at the design, how much R&D the company did, any feedback from manufacturer and users.
Some of the stuff out there is just to please people but I doubt it delivers the goods.
07-24-2023, 01:04 AM
#23
Not impossible, I achieved that sound with Flat6 OAP's and JCR rear silenced valved section on my Spyder with very minimal drone(easy to stay out of 2300rpm where the drone happened). Sounded way better than Soul/Kline/etc. I think the 3" tubing is overblown and is marketing "hype" by the brands who are using it, there's dyno's from those brands showing just rear section gains and they're very minimal. Most of the power gains are coming from either removing the OAP's which have the OPF's or headers with smaller cats/re-routing them.
I will admit most of the exhaust brands for the 4RS are taking longer R&D and putting more thought into the rear sections. Both Soul and Fabspeed have X Pipes and Hemholtz Resonators trying to get that cleaner high pitch sound. I'm in SoCal so I'll end up hearing most of the setups in the next 6months I bet since we have so many 4RS's here already.
I will admit most of the exhaust brands for the 4RS are taking longer R&D and putting more thought into the rear sections. Both Soul and Fabspeed have X Pipes and Hemholtz Resonators trying to get that cleaner high pitch sound. I'm in SoCal so I'll end up hearing most of the setups in the next 6months I bet since we have so many 4RS's here already.
07-24-2023, 01:42 AM
#24
Racer
i don't have experience with OAP's because mine is a 981 but I had zero gains with dundon headers. I spent 5K just for louder noise, i guess.
I am hoping OAP's can make a little difference for the RS though.
I am hoping OAP's can make a little difference for the RS though.
07-24-2023, 05:25 AM
#25
The OAP pipes definitely will give you more power because they get rid of those butt plug particular filters. I just did Cargraphic catless headers on my 981 GT4 and I did Caragraphic catless headers + Arka OAP side pipes on my 718 GT4. Great combo of power and sound on both cars.
07-24-2023, 08:40 PM
#26
Kline inconel was phenomenal on the GT4 but did introduce some drone though what reports claim is much less than other brands. I have the same 4 priorities and in the same order but am waiting for feedback before moving on the Kline system for this car.
07-25-2023, 02:32 AM
#27
Racer
my friend has kline inconel on his 718 and I can't stand the noise. it doesn't have a tone, it's just obnoxiously loud.
07-25-2023, 09:58 AM
#28
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I rest my case - how can 2 different people think a specific exhaust sound so different?! For the last time, this shows that sound is subjective! One has to hear what they are buying first in order to decide if that is the sound they are looking for. (And I still think my Soul setup sounds the best, to me).
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07-25-2023, 10:08 AM
#29
I rest my case - how can 2 different people think a specific exhaust sound so different?! For the last time, this shows that sound is subjective! One has to hear what they are buying first in order to decide if that is the sound they are looking for. (And I still think my Soul setup sounds the best, to me).
