Removing the Cat
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Removing the Cat
I have a Flowmaster 40 series on my 88 Bronco. I've had one cat taken off and want to have the second taken off. Will this make it significantly louder? Will my truck run OK without the cats? Do I need MIL eliminators to keep the "check engine" light off? Can I just cut it out and clamp in a pipe (I don't have a welder)?
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Joined: Dec 2003
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From: Dallas, Texas
is it a 302 or 351
i was gonna do that to mine...a 351...cut the 2nd cat and throw on aflowmaster...is it not loud enough?....is it loud in the cab of your bronco?...my friend has a 351 with out the 2nd cat and a stock muffler and it sounds good
i was gonna do that to mine...a 351...cut the 2nd cat and throw on aflowmaster...is it not loud enough?....is it loud in the cab of your bronco?...my friend has a 351 with out the 2nd cat and a stock muffler and it sounds good
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Junior User
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I don't have the money for that. I just want to remove the cat. Do I need MIL eliminators? Will it run OK without it? All of the MIL eliminators that I can find online are for 4.9L Mustangs. I have a 302 Bronco. Since the sizes are so close will it work? Seems like size shouldn't matter. Rather the vehicle's computer system should matter. Please help.
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From: Hanscom AFB, MA
Is the O2 sensor before or after the cat? If it's before the cats, then you shouldn't need any sort of MIL eliminators. On 5.0 Mustangs, you don't need them, as an "off road" pipe won't effect the sensors at all. However, if you're caught by the police during a routine stop, etc, things could get very rough. Try like $1000 per missing cat plus impound until it's replaced. Just get a different muffler, something like a Dynomax Race Bullet. It's a straight through design that'll be fairly calm at idle and pretty loud at full throttle.
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From: Florida
I just finished putting a new engine in my '89 and I already had one cat missing so I just hollowed out the other one and am running a flowtech afterburner with 2.5" from the headers. I like the sound of it and it's just on the limit where as long as I'm easy on the throttle through the neighborhood the neighbors don't complain. My check engine light was on before so I'm not sure how to get it to extinguish. Good luck.
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Joined: Oct 2002
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From: Texas A&M
You could just put straight pipes out of the cat. They don't change the sound that much. Or you could put a glasspack on there, or pretty much any straight-flow muffler design. Headers change the intonation but not not the level of volume.
P.S. There's a reason those things are on there. Removing the cats off of your truck is not a "mod".
P.S. There's a reason those things are on there. Removing the cats off of your truck is not a "mod".
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