Gut Cat?
02-11-2007, 02:05 PM
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Gut Cat? is it better to gut my cat on a stock rebuilt engine it's a 94Z A4 wtih one cat. will it mess up my O2 readings? i got the LM1 on my car. will i have any back pressure if i cut it off? or should i buy a catco from summit for 50 bucks and have it welded on there. i have the stock manifolds on there. i'm not planning on doing any performance yet. what do you guys think.
Last edited by LT1_King; 02-11-2007 at 02:12 PM.
02-11-2007, 02:22 PM
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I have a 93Z that I cut the top off the cat,cleaned it out and welded a 3" pipe through it ,then I welded the top back on . From the bottom it looks stock. It depends where you live if your car has to be emission tested. The o2 reading on mine are fine. You will still have some back presure with a muffler.
02-11-2007, 06:42 PM
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Originally Posted by Z93
I have a 93Z that I cut the top off the cat,cleaned it out and welded a 3" pipe through it ,then I welded the top back on . From the bottom it looks stock. It depends where you live if your car has to be emission tested. The o2 reading on mine are fine. You will still have some back presure with a muffler.
i don't have to worry about emissions where i live so i will put a strait pipe. did it affect your torque? i heard it affects torque down low.
02-11-2007, 07:03 PM
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The torque difference will not be noticeable. I wouldn't mess with the stock cat. Especially cause many people are looking for them that are not gutted. I sold mine for $50. BTW, I have that catco brand new for sale $40. PM me.
02-11-2007, 07:08 PM
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O2 sensors are before the cat. Hollowed out my cat and then just decided to cut it off and run straight pipe. Good for non emissions county.
