Ernest72

Where do you put the hemholz? I had one on my BRZ and it worked well. But that car had a front pipe and mid pipe. Not much room between cats and muffler. I would love to try it. If I had a design I have a guy who could make things.

Natural1

No idea. Fabspeeds tubes run along the top, but not sure something like that would work with the standard exhaust design. From a little bit of research, assuming a target RPM of about 2100, I think you would need 2 tubes in the range of 900mm each, depending on the average temp in the tubes, which would be hard to estimate. This is where I found that info.....

CaymanCarver

Hey anybody out there have a high-flow cat with the Carnewal / GT exhaust mod?

At some point next year I plan on switching to aftermarket headers with high-flow cats.
Mostly to open up the flow as much as possible.

Nip are

Good luck getting a PSE. I had one on order from suncoast for 18 months and finally cancelled.

Glad you brought this topic up. I came close to getting carnewal when I first bought my BS 2 years ago then moved to the PSE. Think I'll go back to the carnewal now. The reviews are really good and their shop is 1/2 hour from my house.

RWPinNC

2014 BS manual. Bought 3 years ago and installed Carnewal exhaust. No drone, great balanced sound, lots of compliments. A solid and cost effective choice unless you want "boy racer" sound.

boxdriver

I too wanted to buy the PSE for my Cayman S, but like everyone else, I am very disappointed that it is not available anymore. I have been looking for 2 years! It is good to hear that the Cornewel exhaust seems to not increase the drone effect. My question is for those who have made the switch from stock to Cornewel. How is the noise inside the car when cruising down the interstate at 3000 rpms? Is it any louder inside the car than with the stock exhaust? The car is loud already with the tire/road noise and I wouldn't want to add to that with more noise coming from the exhaust. But I would like something more aggressive sounding when shifting through the gears on a fun spirited drive. My thinking is that the PSE would be the ideal exhaust for this reason.

thecajunboy

I have PSE on a base Cayman. I rarely drive without the system in the "On" position. At highway cruise as in your question, there isn't much difference in sound levels inside the car when toggling back and forth between on and off with PSE. When PSE is on, the sound at idle is a little deeper and slightly louder. Also free revs in neutral are a bit louder. The bulk of the difference is under harder than normal acceleration. If the car has Sport Chrono, there will be more audible snap,crackle, pop on deceleration as well when in SC mode.

dps214

Maybe a little louder than stock? Certainly not annoyingly so and it sounds much better anyway. I don't think it's any louder than the PSE at least.

Natural1

Update: Ordered the Carnewal GT Exhaust from Gert today. Should be installed in about 2 weeks. Fingers crossed I like it as much as everyone else seems to.

Thanks again for the input everyone! I will report back.

rr_gts

Please report back after you get it installed and have a chance to put some miles on it!

Thacker

I have had the Cantrell exhaust for three years now and there is no drone. If I could make any changes I would have it slightly louder, like the PSE in loud mode. Good bang for buck, no pun intended~

Natural1

That's interesting, as Gert says the Carnewal GT is slightly louder than the PSE with valves open. I'm just hoping it isn't too loud for my purposes.

rr_gts

Did you order through Cantrell and do the core swap option? If so, let me know how the whole process goes.

Natural1

Yes, I did the core swap option. Cantrell had no 981 exhausts in stock so I ordered from Gert in Belgium, and surprisingly it was a bit less expensive.
It shipped Monday, and arrived at my local shop here in Georgia 2 days later on Wednesday. I'm dropping the car off today for scheduled maintenance and exhaust install.

Ernest72

Well, bought a used PSE off of eBay and installed it. Valves open all the time, no switch or vacuum lines. I have to admit I really love it. But it does sound very similar to carnewal. My carnewal was one I did myself, cut open muffler and cut the pipe then rewelded muffler. I prefer the PSE but they are very close. My custom one only cost me $150 for used exhaust and $400 for the work. Probably gonna sell it for $550 locally. We will see. IMHO get the PSE if you want the valve to quiet things down a little. Not worried about some loudness get the carnewal. Can’t go wrong with either.