100cel large diameter will flow the most.

 

Any numbers you can share of any 100cel system?

 

That describes the type of cats in the Kline and Europipe exhausts.

 

Yes, we offer 100, 200 and Decat.
Web, do you mean hp gains? On a stock car you can expect about 25-40 depending on configuration.

 

I've got the Fabspeed set up with headers love the sound, check there web site they have dyno charts

 

I'll make it easier! Here is a dyno run of our full exhaust system minus the tune. Take a look!

 

@nick from Fabspeed. Will those figures dial back once ecu adjusts to the exhaust?

 

Here is a video we filmed recently of our 3" X-Pipe on a 991TT. This particular car has retained OEM cats, however, we can supply 100 cpi cats, 200 cpi cats or catless with this system. Our system is designed to work with OEM cats OR with hi-flow cats/decat pipes. It's a modular design, therefore, these types of changes can be made at any time.

 

For the most part the ECU does not change the power numbers just adjusts to the new amount of air entering and leaving the car.

This car's ECU was 100% used to the exhaust when we dynoed it.

 

Here's a dyno graph I just found of our Tubi Street exhaust on the 991TT (with 200 cell cats), and no other mods. Stock ECU.

 

We started the development of our exhaust with the new center muffler before moving on to the high flow cats. The results really surprised us, as we found that the center muffler was where all the power was gained. Our Clubsport center exhaust picked up an average of 24whp and 18wtq on a 991TTS running 93oct (blue trace).



When we added some large diameter 200cpsi cats to the exhaust (see the green trace), the car actually lost 50rpm spool, and gained a whopping 7-8wtq. Top end power was virtually identical between the two. We gained a little more than this with the addition of ECU tuning, but ultimately it appears at this level that the stock cats are not a major restriction. Aside from robbing hardly any power, the stock cats also 50 state emissions legal, will never cause a CEL, and do a nice job of knocking a bit of drone and edginess out of the sound of most exhausts. It also delivers the same results while costing $1800-$2000 less than a full exhaust.

This has certainly NOT always been the case in the past. We even went back to the 997.2, which uses a very similar engine to the 991TT/S. With a similar Clubsport muffler design to what we tried on the 991, we gained an average of 13-14whp. With the addition of high flow cats, we gained another 14-15whp, bringing us to the traditional expected ~25whp gained from a 911 Turbo exhaust and cats.

We have found similar results when trying to improve upon the stock exhaust manifolds. While their design may look unorthodox, the 'collector' design and primary sizes are all very 'engineered' solutions, and tend to deliver very good power and excellent turbo response. We are continuing to prototype header designs to build one that will make a meaningful improvement in performance on the car. I don't see a lot of dyno charts published by other manufacturers out there currently selling these, so I somewhat question if they have made real breakthroughs.

Porsche did their homework with this exhaust. While everything has its limits, we have found that at least on the stock turbos, the center muffler is the only major point of restriction. That will change as bigger power solutions are developed that reach far beyond the envelope of the stock components.

 

That´s with headers, right? how much with exhaust system alone?

Thanks!

 

Correct, full system including headers. Below is JUST the Supersport X-Pipe with cats.

 

Nice info... so the 200Cel Cat only give around 5whp?

 

So the headers gain 20whp and 11wtq???