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Old 01-22-2002, 04:13 PM   #1
MaddogWRX
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Member#: 13780
Join Date: Dec 2001
Location: Abbotsford
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2002 Impreza WRX
Black

Default uppipe downpiple cat cat cat

Hey answer me this:

I have been trying to decide what kind of uppipe and downpipe set to purchase. I know all the uppipes have the cat removed. Looking at downpipes which consist of a front and mid pipe also have both cats removed. I guess if you go with a turbo back exhaust you have no cats at all. In order to pass air car in 2 years you would have to put back the cats. My question is: Do you have to put back all the original cats in both the up and down pipes? Can you remove the cat in the uppipe and still pass with your stock downpipes? Could you pass with the uppipe catless and the front and mid catless but use a cat-back exhaust?? What would be a good setup for great performance but still be able to pass emissions without having to swap back the cat pipes????
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Old 01-22-2002, 04:38 PM   #2
Yang
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I think the reason why we have more than one cat is for startup emissions purposes. I believe you should be fine with just one high flow cat in the downpipe with larger diameter piping all the way. The best thing to do is to get the setup that you plan to use checked out at a shop that can test emissions.
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Old 01-22-2002, 04:46 PM   #3
Orbiter
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maddogg..

www.technikmotorwerks.com has uppipes in stock.. also can make you a custom downpipe in a day...


u will not pass with any of the cats removed... so basically run the setup i have.. i have no cats with 2.5" uppipe and 3" downpipe.. u will have CE lights all the time because of the o2 sensor.. but it does hamper performance. when aircare time comes around just switch back to stock.. not a big deal considering you only have to do it once every 2 years
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Old 01-22-2002, 05:05 PM   #4
MaddogWRX
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Black

Default Quality Work

I just had my car into them yesterday. They put in a GFB underpulley and alternater pulley, Cusco strut bar, and my defi gage pod with gages. They work have been excellent. What will it to have everthing swapped out and then back in at the end of the 2 years??
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Old 01-22-2002, 05:26 PM   #5
Orbiter
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Britney Edition

Cool

i dont think the labour would cost more than 75 dollars

just switching exhaust.. easy.. and uppipe.. a bit more work.
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Old 01-22-2002, 06:41 PM   #6
Keiho
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Quote:
Originally posted by Orbiter
maddogg..

www.technikmotorwerks.com has uppipes in stock.. also can make you a custom downpipe in a day...


u will not pass with any of the cats removed... so basically run the setup i have.. i have no cats with 2.5" uppipe and 3" downpipe.. u will have CE lights all the time because of the o2 sensor.. but it does hamper performance. when aircare time comes around just switch back to stock.. not a big deal considering you only have to do it once every 2 years
I think you meant to say the O2 sensors triggering the CEL DOESN'T hamper performance.
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Old 01-22-2002, 09:29 PM   #7
kaibu822
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sorry about this it's a little bit out of topic
but what is the difference between an up-pipe and a down-pipe?
also, can anyone tell me where are all the cats located?
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Old 01-23-2002, 01:05 AM   #8
MaddogWRX
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Black

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the uppipe is a short pipe that goes into the turbo and has 1 cat in it. The downpipe is called a front and mid pipe on a WRX goes from the headers to the exhaust and has 2 cats in it. The downpipe is much easier to replace because there is not as much to remove on the car (I think??). The uppipe is a bit more complicated in that the intercooler etc. must come off for it to be replaced. Correct me if i'm wrong but I think this is close.
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Old 01-23-2002, 03:20 AM   #9
Yang
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little correction... the uppipe goes from the headers to the turbo, coming out the other side of the turbo is the downpipe going into the midpipe and out the muffler. the cats are located in the uppipe, downpipe and midpipe.

Here's a nice looking downpipe:
http://www.i-club.com/forums/showthr...hreadid=123678
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Old 01-23-2002, 04:24 AM   #10
tmr
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'11 STi
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How's this?



TMR
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