98 Expy Exhaust Question
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98 Expy Exhaust Question
What will happen if I remove the cat. coverter from the system and just ran duals, would the brain freak out? I am in a non smog tested area so no regs would apply. Thanks.
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What would be the advantage of removing the cats?? Just wondering why you'd do it - there's basically no HP to be gained and it would freak out the computer a bit. Even though you're not in a smog-tested area, it's not a good idea to pollute when you don't need to.
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I'd be very suprised if you saw a 5hp gain from cutting both cats... Not to mention the fact it would play with your air/fuel ratio a little, be illegal, have more of a chance of backflow (backfire) etc..
Also, you could probably add 15-20 HP to my truck and I wouldn't know the difference simply because it's so heavy.
Also, you could probably add 15-20 HP to my truck and I wouldn't know the difference simply because it's so heavy.
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From: Central NYS
Re: 98 Expy Exhaust Question
Originally posted by OregonTom
What will happen if I remove the cat. coverter from the system and just ran duals, would the brain freak out?
What will happen if I remove the cat. coverter from the system and just ran duals, would the brain freak out?
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Ok i am CONVINCED that i should replace it if faulty and not just cut it off. I was just curious to see if performance would be increased without a serious blow to the environment but I was wrong. Thanks for all the input.
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From: All over Texas
Originally posted by southprk
I'd be very suprised if you saw a 5hp gain from cutting both cats... Not to mention the fact it would play with your air/fuel ratio a little, be illegal, have more of a chance of backflow (backfire) etc..
Also, you could probably add 15-20 HP to my truck and I wouldn't know the difference simply because it's so heavy.
I'd be very suprised if you saw a 5hp gain from cutting both cats... Not to mention the fact it would play with your air/fuel ratio a little, be illegal, have more of a chance of backflow (backfire) etc..
Also, you could probably add 15-20 HP to my truck and I wouldn't know the difference simply because it's so heavy.
I don't know how free flowing the cats are in today's vehicles, but I've gotta believe that they add some sort of restriction to the flow. I remember in the early '70 when they first started putting cats on passenger cars, those things would nearly choke to death any V8 made.
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From: Colorado
i have a 98 expy. and i just had the mufflers removed the cats are enough to dampen the sound...this expy sounds so sweet you would not believe it...i also have all three in pipe cat back..alot better then having duels which are very hard to squeeze past the gas tank....