What do you think would have a better torq curve, a stock exhaust with a full TBE catless or a header and TBE catless?

 

The header/up-pipe combo will get the turbo spinnin quicker. It will create more horsepower and torque. The downpipe will show more power because it wont have two cats in it. Here is the dyno chart of a WRX with the Gruppe-S header.**Dyno graphs shows testing with 04 WRX catted downpipe, uppipe, exhaust, versus addition of manifold only. Hope this helps.

Nick

 

Here it is, dont know why it didnt post the first time.
**Dyno graphs shows testing with 04 WRX catted downpipe, uppipe, exhaust, versus addition of manifold only.

Nick

 

Good info saw that chart earlier, thats what made me wonder about a catless system with or without a header. Possibly more lowend w/o the header, but howmuch do you gain on the top end with the header?

 

That chart is header, up pipe, and stock turbo back vs. up pipe, downpipe, and cat back.

Nick

 

Nick is that a 2.0 or a 2.5?

 

2.0

Nick

 

If it were the 2.5liter i think it would have a little more torque.