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Old 04-25-2014, 06:11 AM   #1
dag01
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Default p0420.. maybe get feet wet with mods?

Recently been getting a P0420 for my cat maybe once or twice per gas tank on my wrx. I clear it and it goes away no problem.. but I figure I should take care of it sometime soon. I was thinking of dabbling with some mods as well since my car is still stock.. would getting a downpipe solve the issue with my cat(in theory)? What exactly does stage 1 entail? And what does it cost as a ballpark figure compared to replacing the cat normal style?

edit: mileage is around 73000.
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Last edited by dag01; 04-25-2014 at 06:13 AM. Reason: mileage
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Old 04-25-2014, 06:39 AM   #2
HinshawWRX
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We can't ball park, but I'm sure you can find an 02-07 stock downpipe for cheap.

Stage 1 is only a tune, or a tune with an intake. It will not fix your issue.

A downpipe with tune will "solve" your issue.
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Old 04-25-2014, 02:01 PM   #3
dag01
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I believe stage 2 is exhaust, uppipe, downpipe and tune. What would just a downpipe+tune classify as? How much power would it provide by itself?
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Old 04-25-2014, 02:36 PM   #4
KJEcho88
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If you have a stock up pipe in the car that should be the first thing you take care of. The cat will eventually break apart and destroy you're turbo.
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Old 04-25-2014, 02:51 PM   #5
pebelz
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Are you sure it's the cat? I had the same problem that got progressively worse. Searched on here and found out an old o2 sensor will do the same thing. Replaced my rear o2 and haven't had the code since.
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Old 04-25-2014, 04:15 PM   #6
dag01
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I'm not 100% positive it's actually the cat. That's just what the error code is saying, I still plan to have the cats tested before I do anything drastic.

Whats this about taking care of the stock uppipe? I thought the cat was in the downpipe?
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Old 04-25-2014, 04:35 PM   #7
KJEcho88
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02-05 wrx's have a cat in the up pipe.
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Old 04-25-2014, 05:33 PM   #8
HinshawWRX
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Quote:
Originally Posted by dag01 View Post
I believe stage 2 is exhaust, uppipe, downpipe and tune. What would just a downpipe+tune classify as? How much power would it provide by itself?
Stage 2 is downpipe + tune (plus or minus intake)

Start researching...
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Old 04-25-2014, 10:06 PM   #9
InTheBurbs_of_Chi
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Quote:
Originally Posted by HinshawWRX View Post
Stage 2 is downpipe + tune (plus or minus intake)

Start researching...
This ^
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Old 04-25-2014, 10:15 PM   #10
Sandy93
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Poohhhhhhhh
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