CATs
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Freshman User
Joined: Nov 2006
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CATs
Hi i posted a while back about an 88 Ford F150 it has two cats and one straight pipe after the cats. I asked about what would make it loud and got some good replies. But today i talked to my mechanic/Car enthusiast and asked him about the muffler i should put on it. He said it wouldn't get any louder with the cats still on there. Is there anyway to get real sound with cats or do i need to remove them?
Junior User
Joined: May 2005
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I gutted my 1st cat and took the second off. I also put a flowmaster muffler on it which I would never have done had I not have gotten it FREE with the truck. Ask most anyone, spending money on an exhaust for a 4.9L is pointless. I've had many different setups on my truck and they all sounded the same - horrible. Of course If your blessed with a 5.8L in your truck or the decent 5.0L then sure, why not? And to answer your question, you cann't really do anything to the cats to change the exhaust tone, unless you either gut em' or lose em'.
Freshman User
Joined: Jun 2005
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How many miles are on your truck?
Lost the muffler on my 91 F250 w/ two CATs and the noise definately increased. A side effect was that I found out that my CATs were clogged from the engine running too rich. So if removing your muffler does not increase your sound output, check to make sure your CATs are not restricting your exhaust flow... ( or eliminate them if you can get away with it?)
Lost the muffler on my 91 F250 w/ two CATs and the noise definately increased. A side effect was that I found out that my CATs were clogged from the engine running too rich. So if removing your muffler does not increase your sound output, check to make sure your CATs are not restricting your exhaust flow... ( or eliminate them if you can get away with it?)
Freshman User
Joined: Jun 2005
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Depends on your state inspection requirements...
If CATs are part of your inspection process, it makes it hard to remove them completely. If not inspected, then better flow would be achieved without the CATs.
Some states only inspect to make sure CATs are in place (no internal inspection), thus gutting may be an option.
Other states inspect via an exhaust probe or through the OBD II ECM, thus proper functioning CATs are most likely required.
I am not proposing that you break the law, but...
If your vehicle is not bound by DOT requirements and you want some real sound... Flip your exhaust manifols over (???) and run short straight pipes through your hood
If CATs are part of your inspection process, it makes it hard to remove them completely. If not inspected, then better flow would be achieved without the CATs.
Some states only inspect to make sure CATs are in place (no internal inspection), thus gutting may be an option.
Other states inspect via an exhaust probe or through the OBD II ECM, thus proper functioning CATs are most likely required.
I am not proposing that you break the law, but...
If your vehicle is not bound by DOT requirements and you want some real sound... Flip your exhaust manifols over (???) and run short straight pipes through your hood
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Lead Driver
Joined: Nov 2002
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From: Concord, NC
I'm not going to influence your decision one way or the other, but removing properly functioning catalytic converters from a vehicle is illegal in all 50 states. You can get away with it in many places because they do not check that they are present. Federal law prohibits this, not just local inspection laws.
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I dont know what the laws are where your at.
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Freshman User
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We dont have emissions inspection right now where i live but i was wondering if anyone has tried the hi-flow CATs? I was wondering if that would work or if that would make any differance at all.
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