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Old 09-02-2008, 12:46 AM   #1
Scooby Newbie
Member#: 71050
Join Date: Sep 2004
Location: Vancouver BC, Canada
05 2.5RS

Default Another Exhaust thread, sorry:Building a custom performance exhaust?

When building a full exhaust system on a budget what parts are best?

I am looking at getting an OBX header off of e-bay. They seem to have one O2 sensor bung. So I am guessing that you only need one bung on your high-flow catalytic converter and that this should be placed on the back end of the exhaust flow (distal from the engine). Are cats directional?

Here is a list of parts that I am looking at purchasing. What do you guys recommend for a cat and is that muffler acceptable.

Am I missing anything other then the labor to have a shop to fab up the rest of the pipe in 2.25?

Thanks guys,


Catalytic converter:
Single bung
Magnaflow 91035


Magnaflow 94135



Magnaflow 12635


O2 Sensor Extender:


O2 Sensor Spacer:

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Old 09-02-2008, 12:59 AM   #2
Back Road Runner
Scooby Guru
Member#: 60082
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Minnesota
2004 Forester STI


Have a look at the 59955 cat. Compact, low 300 cell count.

The exhaust shop should be able to weld in a bung anywhere you want.
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