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Thanks for asking! Great question, though that is not quite accurate. Remember even with valves open you still have partial flow going through that top flow path into the muffler. We deleted the PFs and I drove that car quite a bit, I would not say it is too loud at all and still has excellent sound/tone.
Best Regards,
John Gaydos
Thanks for the clarification! This makes me very excited for your OPF delete option.
As you may have seen in the PSE muffler explanation video in our last post, the factory PSE system is very well designed from a mild to wild standpoint. We still firmly believe that uncorking the exhaust system upstream from that PSE muffler is going to provide an ample improvement in terms of sound and performance to meet the goals of the vast majority of 718 GT4/Spyder/GTS owners. The race headers, street headers, and competition over axles pipes (GPF deletes) are in the final stages of R&D and will be released soon - are you on our waiting list?
That said, some of you may ask... what about the track rats? What about those of us that live in the high rpms and want to hear this car working and maximize the driver’s connection? Those that are in the minority, that don’t value cruising speed comfort as much as weight loss and maximizing flow/sound characteristics. We thought about you too, and this is what we’ve come up with for our Race Exhaust, which can bolt right up to the factory headers or our race/street headers.
The factory dual exit/entry flanges connecting the over axle pipes to the PSE muffler limit the piping diameter to 2.25” - we’ve eliminated those. Our system is full 2.5” all the way as we’ve eliminated the factory over axle pipe to PSE muffler connection. We’re using an X-Pipe to accommodate resonated and non-resonated options. The longer piping routing also helps noticeably smoothen out the exhaust sound while the slight blending of the X gives the car a higher pitched sound more akin to the previous 981 generation we’ve come to know and love. The resonated version sheds 29lbs while the non-resonated variant drops 32.3lbs. The bend profiles are being 3D scanned and our mandrel-bent versions will eliminate a dozen welds from the design. Like all of our products, it is fabricated from T304L stainless steel and back purged with argon gas for maximum longevity under sustained high rpm abuse, and is backed with our Lifetime Warranty for street and track use.
Costing/Pricing is being determined as we speak for all products! Please feel free to text/call me at 4848836197 (14848836197 via Whatsapp) or shoot me an email at johng@soulpp.com to discuss pricing and preorders.
Incredible sound but for me just a little too intense, sure sometimes I would like it to sound like that, but not for just cruising around and trying to go unnoticed.
Hopefully the valved exhaust will be profiled soon?
And what about the over axel pipes and heat shielding?
Can't say as I agree about the 981 being high pitched, but this setup is sounding a heck of a lot more like what was good about the 981. It's got back that blat characteristic that was so good in the 981. Well done, I didn't know if this was possible, appears it is.
Ok, I just watched that video 15 times, sounds great! Text sent for info and pricing
Received, and looking forward to chatting with you!
Originally Posted by JPMD
Looks great.
Does there need to be any additional heat shielding?
Originally Posted by JPMD
and sounds great.
Originally Posted by Westcoast
Incredible sound but for me just a little too intense, sure sometimes I would like it to sound like that, but not for just cruising around and trying to go unnoticed.
Hopefully the valved exhaust will be profiled soon?
And what about the over axel pipes and heat shielding?
Like the previous generation 987.1/987.2/981 exhaust systems (not from just us but most every exhaust manufacturer) we've found heat shielding to not be necessary to include, and we expect the 718 is the same and will provide it without. If our over axles pipes maintained a giant heat soak at the end in the form a particulate filter right by the rear tire, then yes a heat shield may be necessary. However, those are gone and no longer a concern
For those that simply want to go above and beyond with cost not being a factor (no such thing as too much heat prevention) we will provide an optional service of having our over axle pipes sent to Jet Hot Ceramic Coating to have the inside and outside of the pipes coated in their entirety, which would provide better thermal retention characteristics vs a heat shield covering a portion of the exhaust.
Can't say as I agree about the 981 being high pitched, but this setup is sounding a heck of a lot more like what was good about the 981. It's got back that blat characteristic that was so good in the 981. Well done, I didn't know if this was possible, appears it is.
To clarify, in comparison to a stock 718 GT4 the 981 GT4 was a bit higher pitched. You are correct though, in general compared to various other sports cars the 981 GT4 isn't a high pitched car haha. I appreciate the kind words, it's been a very fun project!
Originally Posted by 4MIDABLE
Sweet Baby Jesus.
I think I just peed a little...if I put this on my car, my wife will never ride in it. So DON'T change a thing...it's perfect.
...any in car video/audio?
Well said The GoPro we had in the car while I was driving unfortunately died, I think we managed to get a couple clips though I'll have our marketing guru Mike take a look at what he can put together.
Incredible sound but for me just a little too intense, sure sometimes I would like it to sound like that, but not for just cruising around and trying to go unnoticed.
Hopefully the valved exhaust will be profiled soon?
Valved Rear Exhaust System Update
.
In regards to this topic in particular...The PSE muffler is Very well designed, check out the explanation video below of how. If you want an exceptional valved exhaust system while at the same time uncorking the main performance restrictions on the car, you should strongly consider simply freeing up the flow upstream of the PSE muffler with our competition over axles pipes and perhaps a combination of our headers. If headers and over axles pipes are not something you can do due to stringent emissions restrictions, we are working on a valved rear exhaust solution. .
We have gone through four versions of different valved rear exhausts on this car and about twenty different iterations of them. This car needs a muffler to kill the drone with valves closed, the drone range is too wide (about 1000rpm) to eliminate completely with traditional resonators and/or a combination of Helmholtz Resonators. That brings it's own challenge, the rear diffuser takes up a remarkable amount of space back there to put a muffler. Unfortunately none of the existing dual entry/dual exit mufflers available on the market were suitably designed in shape, size, internals and quality to meet the goals we have for sound/drone requirements, flow characteristics, spacial restrictions and longevity on this car. Therefore, we designed our own bespoke muffler for the GT4/Spyder/GTS!
The first step was to 3D print a muffler shell to accommodate the spacial requirements on the car. Once this was done, we utilized a chambered x-pipe internal design based off of an extraordinary successful venture designing a one off valved exhaust system for Larry of AMMO NYC's Audi R8. The video of that project is below and its a great watch if you want to check out the whole thing. However, you'll see the muffler design in detail from 3:00-4:30. I've also included some photos below of our rendition of this muffler specifically for the GT4/Spyder/GTS. Due to the complexity of this design and how labor intensive they are, we are having our mufflers made to our exact specifications in a large number by one of the fabrication facilities we partner with. This way we will have them readily available on the shelf to reduce the lead time of getting them in your hands dramatically. We will keep you up to date as this progresses
Best regards,
John Gaydos
Don't want to watch the whole video? Skip to 3:00-4:30 for our muffler design
@Soul Performance thanks for sharing the story about the R8, that change between valve's open and closed is perfect, looking forward to something like this. My hope was to go with stock headers, GPF delete pipes and valved exhaust.
@Soul Performance thanks for sharing the story about the R8, that change between valve's open and closed is perfect, looking forward to something like this. My hope was to go with stock headers, GPF delete pipes and valved exhaust.
Staying tuned!
+1 as this is my plan/hope as well. I'm still impatiently waiting on my GT4 which entered production on 6/17.
06-12-2020, 03:52 PM
The GoPro we had in the car while I was driving unfortunately died, I think we managed to get a couple clips though I'll have our marketing guru Mike take a look at what he can put together. 
