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Old 21 Feb 2010, 01:21 PM   #1 (permalink)
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decat up pipe

Why does a wrx have a cat in the up pipe (my03). I see some parts sites say it needs to be removed to prevent turbo damage. Has anyone heard of this damage occuring first hand with out removing it? Has anyone had any proven power gains with it removed? How much - forums say 10 bhp?!
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Old 22 Feb 2010, 06:10 AM   #2 (permalink)
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Re: decat up pipe

I doubt whether 10 bhp peak improvement but there is a definite improvement in spool up and toqure without it and as said it can break down and eventually go through the turbo if running much higher boost with it in.
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Old 22 Feb 2010, 11:08 AM   #3 (permalink)
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Re: decat up pipe

thanks Duncan. Woner why they bother to put it in at all?!! Will have to get it sorted.Doesnt look easy!
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Old 22 Feb 2010, 01:12 PM   #4 (permalink)
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Re: decat up pipe

Quote:
Originally Posted by shambles View Post
thanks Duncan. Woner why they bother to put it in at all?!! Will have to get it sorted.Doesnt look easy!

its easy, as long as the bolts arn;t rusted,,,,,, which they more than likley will be, so more of a pain arse than a difficult job.

also you'll need the map sorting if you do take it out
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Old 22 Feb 2010, 01:45 PM   #5 (permalink)
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Re: decat up pipe

thanks for your advice
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