3" Single Exhaust

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Tulpas 22 years ago

I have an 89 Chev SB 4X4 wi a 350. The 2 1/2" pipes off the stock manifolds join into a 3" pipe then the fun starts. The previous owner modified the system to include a catalytic converter (cat) with 2 1/2' inlet and outlet and a single 2 1/2" muffler. Ive had other 350's and this one feels stifled by the current exhaust system.

Where I live cats are not manditory so Im thinking I could remove the cat and replace it with a 3" pipe, muffler and tail pipe. Im thinking a large muffler off a 454 should do the trick here.

Would this give better economy and performance?

Thanks in advance,

T

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Bret Chase 22 years ago

while I'm loathe to tell you to remove the cat, an 88 should have had a cat w/ 3" in and out. I cut the exhaust off that the PO had installed (a 3" to 2" reducer after the cat and a 2" muffler and tail pipe) because I had the same feeling about my truck. I replaced it with a 18" piece of straight pipe and a 3" in/out universal turbo muffler. I retained the cat and I still got a huge gain in engine power and mileage... I'll never regret the 35 bucks I spent on it.

-Bret

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Tulpas 22 years ago

while I'm loathe to tell you to remove the cat, an 88 should have had a cat w/ 3" in and out. I cut the exhaust off that the PO had installed (a 3" to 2" reducer after the cat and a 2" muffler and tail pipe) because I had the same feeling about my truck. I replaced it with a 18" piece of straight pipe and a 3" in/out universal turbo muffler. I retained the cat and I still got a huge gain in engine power and mileage... I'll never regret the 35 bucks I spent on it.

-Bret

Nov 14

I installed a 3" single exhaust with a flowmaster 40. The truck is noticably louder but not annoying (IMO). Throttle response is much improved. Turns out the old cat was plugged (?!?). I expect fuel mileage will improve now.

Regards,

Tulpas

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3" Single Exhaust

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