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4 ..piece decat exhaust problem
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Old 26 Dec 2009, 09:43 AM   #1 (permalink)
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Question 4 ..piece decat exhaust problem

hi every one,merry xmas to yous all, just wondering if anyone could help,iv a 2004 wrx and have just had a 4 piece decat exhaust fitted,car seems to be running ok but engine management light has come on,is this normal after having cats removed and just need it turned off,or does it need remapping ?? cheers ken.....
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Old 26 Dec 2009, 10:28 AM   #2 (permalink)
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Re: 4 ..piece decat exhaust problem

You'll need a re-map to get the best out of it performance wise, but would re-set the ECU for now to make sure the car adjusts to the de-cat and runs safe. This should get rid of the CEL.

You won't see major power gains until you re-map though.
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Old 26 Dec 2009, 10:44 AM   #3 (permalink)
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Re: 4 ..piece decat exhaust problem

thanks for that rikimaru,merry xmas mate
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Old 26 Dec 2009, 11:07 AM   #4 (permalink)
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Re: 4 ..piece decat exhaust problem

Merry xmas Ken.

On the 04 WRX you may need to fit a CELfix to the ecu. The CELfix stops the rear CEL code P0420 catalyst system efficiency below threshold from appearing, this code being caused by the lack of a catalytic converter in the exhaust. As Wayne said a remap would be best otherwise overboost may occur.
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Old 29 Dec 2009, 06:48 PM   #5 (permalink)
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Re: 4 ..piece decat exhaust problem

merry xmas to you pete,a think il just get it remapped pete,thanks for your help bud,cheers ken..
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