removing cat
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Mountain Pass
Joined: May 2003
Posts: 199
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removing cat
i have a 97 250 with 460. i have the muffler cut off at the cat, and has been that way for a few years. what would happen if i removed the cat? the O2 sensor goes to the cat, can i just leave the O2 pipe hanging in the air? will that kill my mileage? thanx
-jason
-jason
Senior User
Joined: Dec 2004
Posts: 284
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It is a visual fail for an emissions test (if you have it), so just pay the $25 for the test and as soon as they see the missing cats you get a F.
One thing I have heard of people doing is removing the cats and then boring a hole in the cats with a broom stick. It is a brittle, honey comb shaped material in there. You need to have enough cat there to pass emissions.
Joe.
One thing I have heard of people doing is removing the cats and then boring a hole in the cats with a broom stick. It is a brittle, honey comb shaped material in there. You need to have enough cat there to pass emissions.
Joe.
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Elder User
Joined: Oct 2005
Posts: 514
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a friend of mine hollowed out a cat but left it on...screwed up back pressure and gave him crappy gas mileage
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