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how to make oem cat into a high flow one

Old 11-01-2007, 02:35 PM
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i live in iowa.... no emission testing what so ever ... i just want the no CEL otherwise i would just punch it or get a mid pipe
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Old 11-01-2007, 04:36 PM
doin' the bull dance
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Y'all never cease to amaze me with the creative genius. I have nothing to offer but a NT style "Good Job!"

Carry on.
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Old 11-02-2007, 06:33 AM
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I believe someone alluded to this on the first page of the thread. I had the cat cut out behind the front flange and in front of the stock resonator. A straight pipe was the welded in w/o2 bung for future use. Only cost me $35 and the guy who did it said if I ever need the stock cat to bring it back and he'll weld it back in. The best part is the car sounds just like stock.
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Old 09-18-2010, 08:57 PM
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I'm thinking using an air hammer could make this a little easier. Anybody have trouble with doing this??
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Old 09-18-2010, 09:44 PM
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Old 10-31-2010, 12:16 AM
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I did this and reinstalled, sounds good, drives good, but when it idles some whiteish smoke comes up into the engine bay. I think its some of the fiberglass packing. Should I worry or will it burn itself out?
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Old 03-14-2013, 07:22 PM
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Well as Stealth said...i get a big fat FAIL. I removed my cat and started removing the rear substrate. Today, i went to finish and cracked the front substrate and took a big hunk out of it. Thank goodness, I had already ordered another cat from Advance. Before you'll start flaming me for buying a cat from Advance it was only $234 bucks with a 5 year warranty. I put it on and now i'm back in business.....
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Old 03-14-2013, 10:29 PM
Koi no Ousama
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as anyone ever quantified that it made any difference?


Last edited by TeamRX8; 03-14-2013 at 10:43 PM.
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