Which one to do
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Joined: Feb 2002
Posts: 122
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From: Westland but still call Detroit home
Car: 1986 Camaro Z28
Engine: Built Vortec 350
Transmission: 700 R4
Which one to do
Ok I just got my car finished (so to speak). Pulled the LG4 and replaced with a 350. I want to redo the exhaust but not sure of which way to go. Should I do just a single 3 inch exhaust or have the one muffler with two exits. The car doesn't sound like it has any power to it right now. But it has some 
. I want good flow but to have it be somewhat of a sleeper. Feels good when people think you don't have much under the hood and then you smoke em when they want to race. Any input would be greatly appreciated :hail:. I don't have a cat on it right now either and no headers. Hopefully will be able to rectify that soon. Money is an issue right now
. I want good flow but to have it be somewhat of a sleeper. Feels good when people think you don't have much under the hood and then you smoke em when they want to race. Any input would be greatly appreciated :hail:. I don't have a cat on it right now either and no headers. Hopefully will be able to rectify that soon. Money is an issue right now 
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I assume you mean single 3" intermediate pipe to the muffler, then want to know whether to get a muffler with a single 3" tailpipe, or two tailpipes.
Performance-wise, there isn't much difference, although some would argue that the dual-opposite type (like factory) induces more restriction since the gases have to go in two different directions. But, for most vehicles, the difference isn't quantifible.
In your case, sounds like you want to keep it stock-looking. So, dual 2-1/2" tailpipes on opposite sides should do you just fine, and look more factory-like than either single 3", or dual 2-1/2" on one side. I went with the dual-opposite for that very reason, but my 305 likely doesn't flow as much as your 355 will. However, the late-60's muscle cars were running 12's with their big blocks and 2-1/2" dual exhaust, you shouldn't suffer too much with the same size tailpipes.
Performance-wise, there isn't much difference, although some would argue that the dual-opposite type (like factory) induces more restriction since the gases have to go in two different directions. But, for most vehicles, the difference isn't quantifible.
In your case, sounds like you want to keep it stock-looking. So, dual 2-1/2" tailpipes on opposite sides should do you just fine, and look more factory-like than either single 3", or dual 2-1/2" on one side. I went with the dual-opposite for that very reason, but my 305 likely doesn't flow as much as your 355 will. However, the late-60's muscle cars were running 12's with their big blocks and 2-1/2" dual exhaust, you shouldn't suffer too much with the same size tailpipes.