Itzkirb

I'll try and take some new video in a couple weeks when I have the car back. Minimal drone, I'm able to still have a conversation with the passenger and also take calls over bluetooth (Valves open and closed)

I have some driving at normal speeds vids on my YT channel.

9914s

Hey John,

I really would like to add the CMD to my GT3. How would you describe the drone of the race version against the drone of SMD with the valves open all the time? Btw love my SMD best mod so far.

thanks, Marcos

SToronto

This week I put on Akrapovic centre bypass and Akrapovic link pipes. My car only has 350km on it so still running engine in, my revs are kept below 5k, mostly below 4K. I'm loving the sounds being made by the setup and think it suits the car well. My only hesitation at this point is the volume. Need some more seat time but I'm thinking it's too loud, would be better for me if the volume could be turned down 1-2 small notches. Or at least have the option to.

John - can I combine your valved link pipe with the Akrapovic centre bypass?

Thanks!

Soul Performance

Nice setup Kirby, thanks for chiming in

Marcos, great question! I'd love to give you an in depth description but my screen time and typing is a bit limited with a concussion and broken hand. Could you give me a ring at 484 883 6197 at your convenience? I'll be sure to properly educate you on it.

If you are still running the factory headers and the Akra center you are running is the one photo'd below, yes our valved side bypass pipes should be a direct fit. That said, i'd like to help walk you through what it will accomplish for you and how. Give me a ring at 484 883 6197 at your convenience : )



Best regards,
John Gaydos

MJG911

Marcos, I tried the race version before settling on the CMD only. There was a very slight drone at 70 cruising with the full race system, but that's about it.

9914s

Thank you sir, I appreciate the replay. I think I’m going to call John sometime next week to pick his brain about it.

SToronto

Thanks John. Yes factory headers just Akra link pipes and centre bypass. Will give you a ring, hopefully this week.

Soul Performance

Thanks for chiming in with your feedback Michael

I'm at your disposal and look forward to chatting with you.

Sounds like a plan, give me a ring any time.

Best regards,
John Gaydos

FourT6and2

Well, it's been 5 months. How goes it with these video comparisons? I can't speak for anybody else, but I'm not buying a single exhaust product from anybody without:

1. Comparison videos (stock vs product)
2. Dyno chart (stock vs product)

The last thing I want to do is spend money on something to sound cooler only to reduce hp/tq in the process. Even if it's minimal.

Soul Performance

To be honest, terrible. I brought in a good friend's GT Silver 991.1 for development of the modular competition exhaust, and this was the car I planned on installing just the side and center muffler bypass pipes on and doing video comparisons. I managed to get good footage of the competition setup and just the center muffler bypass, but before we had a chance to get just the side muffler bypass it started raining and didnt give us a break for video for the remaining three days we had the car. Unfortunately since that time we had not had any in house installs on the GT3 platform and he is located too far away to arrange a drive over to repeat the videos. However. he left with just the side muffler bypass pipes and I'll be tracking with him this season at some events. I plan to meet up with him at the track to try and duplicate some of the videos we've done at the shop, on his car to complete the comparison video. Or if I get lucky, maybe I'll find a local fellow who wants to come in to have them installed, or has them and will come stop by. If that person is reading this, call me! : )

I've driven enough of these cars on track, on the street, and reviewed acceleration/mph data between cars with various combinations of exhaust systems to know that after the headers the performance change is negligible. I've seen and felt no difference good or bad in performance from side muffler bypass pipes or center muffler bypass pipes, and I see no reason to invest the time and effort to dyno those particular products as I don't sell them for that. If you're concerned about power loss you can ask anyone in this thread, or I can provide you referrals to chat with, to discuss what they have experienced for themselves in real world conditions. I have not had a single complaint. If you still have hesitation, I have a proposal for you personally that I feel would meet your goals and help you feel more comfortable moving forward with something. Feel free to give me a call at 484 883 6197 any time to discuss

Best regards,
John Gaydos

Psup4s

Great write up John, I may consider doing a cat back system but not sure how loud that will be get specially at the track

mdrums

I have Soul Valved Side Muffler By Pass Pipes. I ran my .2GT3 for about 2000 miles and 1 track day in its stock form. I then installed the side by pass pipes...have run almost 2000 miles and another track day. I did not get anymore mph on the back straight at Sebring...thus they do not make or lose power. If there is any power shift or difference...even if they make 10hp you are not going to notice that on the track or street. My thought is you might gain a few HP from 7-9k rpm with the slightly less back pressure. What I can say is my rear tires do not heat up as much now that the rear side mufflers are gone. Thats is a nice win!

However I can tell you the quality of the Soul Pipes, the price and sound is outstanding. Dealing with John at Soul and other places he has worked I have found him to be a guy just like us....a track and performance guy. He is honest with what he sells...he just wants happy customers. I currently run my side pipes with the valves unplugged. The car sound great on the street from 2-4k rpm with open valves. Barley any drone around 2100-2400rpm just every the slightest but not a sound sound like other exhaust systems I've had in other cars.

FourT6And2 I suggest you give John at Soul a call and buy the Side Muffler Pipes....you cant loose...then if you want louder just unplug the valves...then if you want even louder call him back and buy his center muffler delete. You have a well built completely modular system this way.

Itzkirb

+1 for Soul quality, price, sound and working with John

krell

Define minimal.

The risk here is so low that I submit if there is any loss at lower RPMs it will not be noticeable or impactful.

FourT6and2

If a power loss offsets the benefits of weight loss, then it's pointless to spend a couple grand doing it—whether you notice it or not. And if you don't notice a 10hp loss, you're not going to notice a 30lb reduction in weight on a 3,000+ lb car either. So again... why spend money doing something that has no real-world benefit?

Cool, you ditched 30-40 lbs off the rear of the car. But you lost 5-10hp in the process. And you had to spend money to do it. I'm not saying this what actually happens. But personally, I'd want to know before wasting the time and money. If you can save 30-40 lbs AND not lose any power, then awesome. So far, of the 8 companies that offer valved side bypasses, not a single one has provided data to support the claims.

I'm not picking on Soul, specifically. This applies to anybody selling these things.