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Old 09-17-2011, 07:18 PM   #1
fantasticfour
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Member#: 215453
Join Date: Jun 2009
Chapter/Region: SCIC
Vehicle:
2000 2.0RSTi
Aspen White

Default WRX catback on swapped GC.

Sorry if this has been covered but I've recently finished my EJ20K swap into a 2000 RS. A friend has been kind enough to donate his stock 2002 WRX catback exhaust. It was about 10" too short so I had a local muffler shop weld me up an extension so it could bolt up to the JDM downpipe/cat.

Now how much power could I be losing using a WRX catback? I didn't want to pass up on the FREE exhaust but will this cause problems later? But if it's negligible, I can live with that.

Also, if I were ever to replace this exhaust, I would have to look for a JDM one correct? Or perform the same mod on a USDM exhaust?
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Old 09-17-2011, 07:51 PM   #2
suberdave
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Location: Covington, WA
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88 GL-10 STi
silver

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if you use a USDM Down Pipe. then any USDM cat back will also fit. the differance is in the down pipe.

-=Suberdave=-
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Old 09-17-2011, 07:53 PM   #3
beaviscih
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Sold, '04 STi - Sold

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You shouldn't notice a power difference with the WRX cat back at this point in the exhaust chain. That said a catless downpipe would be a plus but it sounds like you are set on the JDM DP since you had an extension installed.
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Old 09-18-2011, 03:13 AM   #4
fantasticfour
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Aspen White

Default

Thanks for the replies guys. My mind did wander though after I read JDM DP. But anyways, yes I wanted to use the JDM downpipe cause that's where the JDM oxygen sensor is.

The USDM sensor pigtail is longer and can bolt into the USDM up-pipe, but I didn't get the up-pipe.

Do USDM aftermarket downpipes have a bung for the oxygen sensor?
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Old 09-18-2011, 02:21 PM   #5
Jaxx
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you have to add the O2 bung .. should be cheep i think i paid $12 (with materials) to have one welded on a usdm down pipe

it is slightly more expensive when you move to Stainless but still not terrible
i have had to do it to all three DPs that i have owned
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