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Old 06 Oct 2005, 05:57 AM   #1 (permalink)
Young Scooby
Join Date: Jun 2005
Location: Huntingdon
Posts: 62

I have made my own decat by getting hold of a broken cat off a wrx. I have hollowed it out and welded it back up.

But when I have taken my old cat off of my car (sti V5) I have a slightly different opening to the front of the pipe. My original pipe has this opening:

As you can see it has an opening for the wastegate side too. But the one I have fitted only has the one main opening:
(sorry for stealing somebody elses pic)

My question is:

Would it stop the wastegate performing properly. I have already fitted it and there doesn't really feel any difference to the performance of the car. The pick up is very slightly smoother (not such a kick when the turbo comes in) I was always under the impression that a decat makes quite a noticeable difference on a turbo'd car.

Should I take this home made decat off before it does any damage to my tubo/engine?
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Old 06 Oct 2005, 05:33 PM   #2 (permalink)
Scooby Fanatic
Join Date: May 2004
Posts: 636
it will not be as good as a decat as you still have the big pipe there messin up the airflow,where as a straight pipe increases air flow :wink:
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