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Old 10-23-2001, 09:33 AM   #1
Scooby Newbie
Member#: 5852
Join Date: Apr 2001
Location: Georgia
2002 WRX

Default I need your input on exhaust modification.


I am to soon get my car back from a shop that has prototyped a 3inch catless mandrel bent exhaust from the turbo back. The company is not going to build an up-pipe at the present time so it has the original up-pipe with the cat.

1) With 1 stock cat ahead of the turbo do y'all think I'll be throwing the CEL?

2) With just the turbo back exhaust am I going to gain any power?

3) Will the original up-pipe cat suffice for emissions testing?

Any input appreciated.

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ttg is offline   Reply With Quote
Old 10-23-2001, 09:45 AM   #2
Scooby Newbie
Member#: 4915
Join Date: Mar 2001
Location: Colorado Springs,CO, USA
2002 WRX Sedan


Unless you put some electronics into the o2 sensor, you will *definitely* throw a CEL without any cats after the turbo.

MJSpiers is offline   Reply With Quote
Old 10-23-2001, 10:27 AM   #3
Scooby Specialist
Member#: 6426
Join Date: May 2001
Location: the "looks like a mitten" state

1- like mike said, you'll most likely throw a cel.
2- you will probably see some power gains, hard to tell how much tho.
3- no. at least i doubt it.

the reason you will throw a cel is, there are 2 o2 sensors in your exhaust, and they need to read a different value from eachother. for example, if there is a cat between them, which it sounds like you dont have...
trboCIVIC&WRX is offline   Reply With Quote

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