hf1

Wow, very promising and great sound in the video. So to confirm, the video car had only the filter chambers removed — headers, cats, and mufflers were all OEM? No CEL?

Soul Performance

That is correct sir!

DFW01TT

I'm very pleased to see this John.
I have the Soul valved exhaust on my 981 BS and I just love it.
If the new Spyder is exhaust sound impaired, I'll be calling my Soul dealer.

CDACH

I read that the muffler/tip interface on the OEM setup was pretty restrictive. Does replacing the tip only improve that or is the restriction both the tip and the muffler/tip interface?

Great to hear the improvements on the video with a pretty minor mod! Nice work. Spyder arriving in September so you have a few months

kart125

Interesting thread! Great to see more options available for the GT4 and spyder. Once I get car if not pleased with sound I'll seriously consider an exhaust mod and this "sounds" promissing. The JCR system is also appealing but the pounds to CDN dollar conversion is killing us!! Cant wait to see the price for this system with different options.

Jim Rockford

Euros have the deck severely stacked against them. They will have to turn to pricey exhausts to overcome the volume handicap of the OPF. You see there aren’t even resonators in the systems they’re serving up, they have to go to pipe arrangements, the OPF must be choking off that much volume. And without the ability to use a resonator that will also limit tuning range of tones they can achieve. Usually it’s us in North America that gets the short end of the stick... nice to see it’s the other way around for once. Save that disgusting SiriusXM antenna.

Westcoast

@Soul Performance Interesting that you guys seem to be the first to profile the over-axle pipes and even provide a sound bite of the OPF delete, great stuff, keep it coming!

Additionally, the over-axle pipe looks to be the most simple of all of the modular sections, essentially mating to the header output and muffler input with a properly sized and shaped pipe, will its cost reflect that and what material will it be offered in?

Cheers!

spyderphile

I'm guessing over-axle pipe is the one that contains the GPF (or, inert filter)? If so, with GPF-delete and valves-open, the sound is promising, as expected. While keeping the cat and header stock, a muffler with merged design would be a perfect setup. It will pass emission tests; and, possibly pass noise limits in the US/Canada. Can't wait!!

911F1

+1. I'd be interested in the over axle pipes. I'm not interested in changing out the headers or muffler sections.
This section looks to be best way to get some sound back with out breaking the bank.

InTgr8r

SOUL works with T304L Stainless steel with a nice satin finish.
I have their down pipe on my 718 Cayman.
Quality is exceptional and its also guaranteed for track use.

The 981 GT4 uses this, I'm assuming the 718 GT4 product will be the same.

Soul Performance

I’m happy to hear you’re enjoying the 981 valved system! If you find the Spyder is a bit lacking, let me know when you’re ready and I’d be happy to work with your dealer to spice it up a bit

The tip replacement with have little to no effect on the sound or performance at all. We haven’t measured the opening of the tip outlet pipe yet but that is on the to do list

I appreciate the consideration! Jonny makes a superb product, we’ve had many conversations over our time in the industry together and I consider him a friend/colleague. I look forward to seeing how we both push each other and the Porsche platform forward as time goes on.

In all fairness we still did get a restrictive core those over axle canisters and PSE programming that puts a real damper on the sound haha.

We had a nice head start. The 718 GT4 Clubsport has been out in the US for quite some time. Due to our excellent relationship with PCA Club Racing (we are a sponsor and exclusive provider or replacement headers for the Spec Caymans) and associated race shops, we received two brand new Clubsports at our facility several months ago to take a peak at. As they share a very similar exhaust system (though not exactly the same) we were able to start on the over axle pipe development early this year in preparation for the arrival of the 718 GT4 development car. Despite it’s appearance the bend profiles were quite a challenge and those ridiculous flanges to the rear muffler were not easy or inexpensive either. Our over axle pipes will be made from T304L stainless steel like the rest of our product line. Tig welded, back purged, and with a lifetime Street and Track warranty. We expect you to go beat the snot out of them as much if not more than we do, just like everything else we offer haha. Even so we expect it to be the most cost effective exhaust component on the car, and we always strive to be reasonably priced.

Yes that is correct, and we also look forward to the results of combining with some muffler replacements

Thanks for the interest, let’s keep in touch as we get closer to finalizing the product and making an official release

Regards,
John Gaydos

kart125

This is nice and refreshing to read! This is what creates awesome products in the end for us, respectful competition between manufacturers without disrespect or product bashing! 2 different strategies/philosophies could leed to equally good products for the end user! Now let the new toy come in so I can get some mods going in real life instead of in my dreams!

Greg_STL

Thanks for putting together a very detailed post about the exhaust system and your development. You have fallen in the trap of providing information which makes me just think of more questions.....

As far as the vacuum line - why block permanently? I would think you could put in a small mechanical stop-**** valve that would give more options. I could see my self leaving it open so that I could sneak out of the neighborhood (using either stock button location). Then, when I get to the track/cars&coffee/autox I could reach under the car and shut off the stop-**** (effectively blocking) so that the exhaust valves stay open for the whole event. I think I could source two metal valves, some tubing, and couple crimp clamps for pretty cheap. For that matter, has anyone ever hooked up your remote control valve system in series with the stock system so that you could have OEM quiet, OME loud (with your remote set open and the PSE button pushed or not) and the exhaust valves open all the time with your remote system turned off (basically ignoring the stock system)?



For the OPF delete pipes, the OEM section has some heat shielding on it since the pipe is so close to the rear tire/brakes. I know you have offered ceramic coating in the past - do you think that would be effective in this situation to keep heat away from the tires/brakes?

The space available for the headers looks very tight if you keep a catalytic converter. Any thoughts to moving the main CAT to the OPF location. I know the cat would not fire off as quick but you could get more room for long tube headers and still allow for the existence of a cat for those that think such a thing is a worthwhile endeavor.... I imagine the hard part would be making a kit to lengthen the sensor wires and finding a way to route them.

JCR-Porsche

Classy as ever John and a great informative post. I knew it wouldn’t take long before you guys were bringing a bunch of products to this platform, keep it up

Nothing but respect for John and the Soul team. As I always say, choice is a wonderful thing and ultimately owners will reap the benefits.

It just shows that there’s no need to attack others in the industry if you have confidence in your own work / products like John does. Keeping posts informative and to the point rather than intentionally setting out to baffle owners and leading people to believe that the science behind this stuff is akin to black magic is also refreshing to read

JC

Jim Rockford

Steel sharpens steel. This is how it is supposed to be. There will be right choices for all owners in all geographies, glad we have a positive informative bunch providing high quality aftermarket solutions to consider. This isn’t always the case.