Stock WRX DP on SS?

Stanky Leg · Post by **Stanky Leg** » Sat Dec 20, 2008 8:48 am

if we put a stock WRX downpipe onto my 91 SS, and extend the O2 sensor to go into the bung, will it make it run weird? because there are 2 cats before the sensor.
somebody mentioned that it might run rich, is that true?

Grayguy · Post by **Grayguy** » Sat Dec 20, 2008 3:36 pm

why would you go though the trouble to add more restriction to the car?

Stanky Leg · Post by **Stanky Leg** » Sat Dec 20, 2008 5:45 pm

because i dont have enough money for a catless downpipe right now, and i'm going to have the exhaust built from the WRX downpipe, and then when i can get a catless wrx downpipe, it will bolt right up to the exhaust i'm going to have made at a shop.

ultrasonic · Post by **ultrasonic** » Sun Dec 21, 2008 8:55 am

I have a WRX downpipe on my 91 SS. The installer welded in an O2 bung in the same location as the stock downpipe. It's worked fine for tens of thousands of miles. Seems to me that extending the sensor to the stock WRX location is more likely to cause out of range data for the ECU.

Stanky Leg · Post by **Stanky Leg** » Sat Jan 03, 2009 5:43 pm

well we don't really have any other options, so we're gonna see what happens today...

PhyrraM · Post by **PhyrraM** » Sat Jan 03, 2009 9:54 pm

The WRX has it's O2 sensor before the up-pipe because of all the catalytic convertors. Placing it after any catalytic will most likely cause a rich condition in closed loop driving.

Stanky Leg · Post by **Stanky Leg** » Sun Jan 04, 2009 2:47 am

hmm ok.
well we did it anyways... haha
we waited long enough.
but we should have a catless downpipe soon anyways.
so hopefully it won't cause any problems for a little while.

adema2626 · Post by **adema2626** » Sat Jan 10, 2009 3:37 am

Sounds like you found a catless dp. But i have a bellmouth 3" dp i'm looking how much you willin to spend?

RJ93SS · Post by **RJ93SS** » Wed Jan 14, 2009 6:07 am

i just put a perrin divorced downpipe from a rex on my car, i plugged the 02 bung and welded an 18mm fine thread nut in our stock location. running an 02 after the cat is a bad idea as the 02 controls so much and when not working properly can cause alot of problems.

i would get that changed asap.

it's a good idea for building an exhaust off of though.

boarderbw · Post by **boarderbw** » Thu Feb 12, 2009 9:25 pm

i got an catless dp off ebay for like 100 and cut the bung out of my old dp and welded it into the ebay one. cheap and easy

green91 · Post by **green91** » Sun Mar 15, 2009 6:24 pm

Take your catted DP to a scrap yard, the value of the cats will nearly pay for a brand new ebay wrx downpipe.

vrg3 · Post by **vrg3** » Tue Jun 02, 2009 1:27 pm

In the meantime disconnect the oxygen sensor. The ECU won't mind running without it.

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Stock WRX DP on SS?

Stock WRX DP on SS?