JBrady
Active Member
- Messages
- 1,776
- Location
- Houston Texas
I enjoy all HP automotive applications and frequent other forums. Did a search for the Subaru WRX and ended up finding this company, Cobb Tuning. Their downpipe for the turbo Subaru's is second to none and they have a six page description of what they did and why. It has pictures and details including great info on the differences in catalytic converter construction, performance and durability.
Highly recommended reading.
Remember, these are turbo engines and exhaust flow requirments and response characteristics differ from non-turbo engines. I ran a 3" system (designed and tig welded myself from mandrel) on my old TBird 2.3 turbo engine even though it only made about 250hp (pretty good for the 80s). I also intend to test 2.5" vs 3.0" for my 300+hp 1999 LS400 engine. While the low end response on the turbo engine was enhanced by the 3" pipe on my non turbo 1UZFE it may be hurt... hence the need to test. This is for the center single pipe section. I will use 2.25" for the dual sections. I would actually try 2.125" if available but going with 2.25" as best compromise.
Here is the link:
http://www.cobbtuning.com/wrx/wrx-downpipe.html
Highly recommended reading.
Remember, these are turbo engines and exhaust flow requirments and response characteristics differ from non-turbo engines. I ran a 3" system (designed and tig welded myself from mandrel) on my old TBird 2.3 turbo engine even though it only made about 250hp (pretty good for the 80s). I also intend to test 2.5" vs 3.0" for my 300+hp 1999 LS400 engine. While the low end response on the turbo engine was enhanced by the 3" pipe on my non turbo 1UZFE it may be hurt... hence the need to test. This is for the center single pipe section. I will use 2.25" for the dual sections. I would actually try 2.125" if available but going with 2.25" as best compromise.
Here is the link:
http://www.cobbtuning.com/wrx/wrx-downpipe.html