cooler2442

Does it sound better than stock? Yes. Does it sound as high pitch as what we've heard from the JCR or BCfabrications? No. Even the Soul/Fabspeed rear section may have a higher pitch than Kline.

Montaver

Sounds pretty damn high pitched to me

Also that video is clearly not WOT or near redline so not sure how you can make a definitive judgment based on that really

UncleDude

I think I’d wait for a few more sound clips (for all) systems before deciding. I don’t think this car will be any different than the GT cars, there should be something for everyone’s goals and drone thresholds.

Rennolazine

We need some high speed flybys and interior footage for better sound comparisons. The interior volume and tone differences are also major with the different setups since the engine is sitting inside the car with the window brain tubes. The 4rs is uber sensitive to decorking. Also the ecu is very finnicky (and its uncrackeable for now*sort of).
My predictions based on my seat time in a few setups are:
1. there will be 2 camps with respect to 4rs mods. a. Sound/tone refinement and b. max power/performance camps. They will be mutually exclusive imho. The biggest impact mods for track are dundon’s chassis/aero mods for this car. Its a compromised chassis
2. The M engineering dyno video is gonna break the internet. Having heard some power focused mods i will say this. Do not assume because u had a gt4/spyder/gt3 youre ready for the sound intensity. Youre not unless u run/smoke a crack pipe. Its legit some of the loudest stuff on earth save a cup car sequential gearbox. But there is some very unique and interesting sound technology that is being developed because this car is such a monster. Ill let others elaborate
3. if u are very sensitive to noise keep the stock muffler or everything else proximal to a rear pipe stock. Harry metcalfe measured the car 105-110dB stock and its no joke 7-9k rpm. Its insane
4. we need customer 60-130s to make accurate gains conclusions because i think dynos are very hard to replicate with the exhaust length and ecu mapping. Its going to be interesting to see how a dyno gain translates to 100-150mph airflow through the car on the pavement
*these are all personal opinions and alot of the gains can be felt and are real*
*this post has been heavily edited for typos and sensitivity to various products/platforms. 4rs is pushing alot of limits which is a good thing

lovetoturn

You also get to bolt the rear heat shield back onto the Kline exhaust.

https://www.kline-innovation.com/exh...che-718-gt4rs/

Rennolazine

Grab some booze and watch this….

cooler2442

Few observations after watching this:

1. Same gains as Dundon/Fabspeed dyno's that have been posted basically. Not seeing any secret sauce here.
2. Soul full system still doesn't have that clean super high pitch scream like a titanium/inconel JCR or BCFab exhaust. I wonder if you really need the exotic material to get that clean high pitch sound. Soul is definitely higher pitch than stock but it does not sound "clean" and has a bit too much raspiness from what I'm hearing compared to other exhaust sound clips.
3. He should have posted an easier to read chart at the end with the different setups and actual #'s.
4. Deman 4.5L dyno is insane compared to the 4RS.

rooster17

Some more exhaust goodness. JCR this time around. I’m still personally undecided. Waiting for some Kline video. And price, have yet to see their prices.

GT4rsG

Me neither , very undecided , saw kline’s video i much liked the sound but the video didn’t satisfied me at all . Waiting for other clips from kline also they released a video with 200cell cats and they offer 100 cell and DECAT so we don’t have any info about the sound with 100 cell and decat .

Scrappy1972

Does the Dundon OAP include heat shielding?

twospyders

Dundon: What’s the word vs the others?

twospyders

My thoughts regarding US version GT4RS power/ sound modifications:

1. The stock muffler is awful. Stock exterior sound is absent.
2. Adding power via hardware sacrifices interior intake sound while providing good exterior sound (assuming stock muffler replaced).
3. Is it worth it to lose the signature interior sound for improved exterior sound and power?

I’m leaning to sticking with the stock 4RS set up to keep the signature interior sound. Of course I’d rather have more power and exterior sound if I could keep the intake sound.

Note: I have a manual GT3 991.2 with various Dundon upgrades and I am thrilled (sound/ power).

Thoughts?

Rennolazine

youre spot on when u say the stock muffler sucks. Its very quiet like the 718 gt4 but once the valves open its like goats having sex with eachother

twospyders

Thanks for the reply. I don’t think your link works. I have not seen a single video retaining the interior intake sound with pipes/ exhaust upgraded. Love to hear it differently.

cooler2442

I ordered heat wrapped OAP's that arrived today(won't get around to installing for a week or so though) which 1. Will give me 20-30hp according to dynos. 2. Cut some weight. 3. Give me 20-30% louder sound than stock but keep that unique intake noise. 4. Allow me to pair any rear section I want later.