Kgoheen

I just installed the Akra slip on with black ti tips on my 2020 GT4. I chose Akra based upon my experience with their motorcycle exhaust systems on my KTM’s and Ducati’s. Always more than satisfied with their excellent quality and performance.
And to Larry’s point, I could not live without those awesome tips!
I am very happy with the sound - significant noticeable difference but not overly loud. I only installed the slip on, everything else is OEM.

SupremePower

Thank you! Had to do it to keep things rolling out for you guys. Few in stock now and a bunch more in production for us for stock.
No need to wait 15 weeks on Inconel systems for you guys.

Kline Valve control button kits in stock right now as well as the their tips.

Really looking forward to hearing your feedback and the sound!

Thank you Barry! Appreciate the kind words and your years of support.

jmartpr

The reason is simple...I really HATE how the stock PSE sounds. It's not a Porsche sound. My previous GT4 had race headers and a GT3 muffler conversion...now that's a great sound and would pay whatever to get it on the 718.

So to update on the Akra + Dundon setup....I did the install today. The sound with PSE OFF is very close to PSE ON with the Dundon Street setup and OEM PSE, slightly lower volume than Dundon PSE ON but a bit more aggressive tone (deeper). I kind of like it and can be use daily no problem.
Now PSE ON with the Akra + Dundon Street setup it's basically a lot louder with more bass (deeper tone)...not a big fan of this.
The reason is that Akra is doing the simple easy solution to PSE ON...they just dump each bank out from the open valve section. No mixing of both banks, X cross piping or anything, just a straight tube from the valve to that side exit.
IMO you need somehow a mixing of both banks, with PSE ON and OFF, in order to get a good tone, more in line with other Porsche models.
Guess I will keep on waiting for Dundon's solution and if not a Cargraphic X Racing could be the answer.

UncleDude

I think Soul’s rear section mixes in the X valves open and closed.

jmartpr

Yes it does but I'm not too hot on that system.....

Mike0105.

Is there a particular reason why? Seems like it is really well designed and one I'm considering along with the JCR.
Mike

jmartpr

On the open valve path I think we will need more area to allow a larger quantity of gases of both banks to mix...I had their race system and it sounded Ok but not great IMO. The open valve path is basically like the Race system.

Regul8415

Appreciate the feedback. I’m on the fence with exhaust as I’m quite satisfied with the headers. Will be interesting to see what Dundon come out with, their current cracked pretzel is a bit of an overkill for sound.

Soul Performance

Thank you for considering us!

Our Race Exhaust is a very different exhaust with a very different goal. The Race Exhaust is designed primary for maximum flow through a primary flow path, weight reduction, and with the option for resonators to cut down on rasp. This system was designed primarily for performance. Our Valved Exhaust System was specifically tailored around the sound and tone experience and tested with other exhaust components to make sure it still sounds great with other exhaust mods. 100% of the flow for the RE makes it way our a primary flow path with an X. On the VES the majority of the exhaust flow makes it's way through the primary flow path while there is flow through the perforated core X-pipe muffler and then blends again with the outgoing primary path flow. This design has a great effect on reducing drone and enhancing tone. The difference between the two is audibly different and we put a great effort into making a system befitting of a GT4- and we'll back our confidence in the system with a money back guarantee.

-Mike

jmartpr

Thanks Mike for expanding and adding info on your Valved muffler....this car is a challenge in terms of making it sound correctly while, if possible, adding a bit of power.
To add to my experience with the Race System...I think is the best value for your money out there and you guys are great in terms of service and transparency....sound wise I did like it, it's different, but I'm spoiled by my previous cars.
This whole testing thing is starting to get a bit expensive....I still feel the solution lies on a muffler system similar to a GT3...not sure if that will be possible...where both PSE ON and OFF use the muffler with different pathways inside of it.

afisherunc

To supplement this, my dealership installed my Kline OAP + rear and the service associate said it was the best fitment he had ever seen on an aftermarket exhaust on the GT4.

SupremePower

Some beauty shots of the Kline....simply amazing

Dave I

Can you post or pm some info on the exhaust tips pricing options?

SupremePower

Kline offers three tips:

Carbon MSRP $920/set
Inconel MSRP $845/set
Stainless MSRP $545/set

Inconel and stainless look identical to each other. Guessing the Inconel will burn in a nicer color and weighs a little less.

For RL pricing or to order or for any questions please PM or email sales@supremepower.com and we would be happy to assist

kitwetzler

When I'm doing any sporty driving, I use my valve controller to lock the valves open and I find that much of the time, I'm perfectly fine with the valves like that, even in normal driving. The Kline gets much louder at 4000 rpm -> 5000 rpm anyway, so the valve controller is almost unnecessary. Without a valve controller, the transition is pretty sharp and when you're driving a twisty road, you cross that threshold a lot so it is kind of obvious.

Glad to hear you enjoy the Kline! I love mine - I'm curious if you can tell a difference with the Iconel, maybe we ought to do another coffee meet. . (or actually take a drive this time)