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Old 05-01-2011, 09:42 AM
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whats the best size pipes for exhaust or does it really matter?

i got a 1973 z28 with a 406 sb not sure the cam size, all i know is 520 lift, flat top motor with aluminum heads and 750 dp holley. it runs great but has exhaust leaks everywhere and i dont know too much about exhaust systems. if i went with anything bigger than 2 1/2 pipes out the back would there be a big difference in performance?

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Old 05-01-2011, 10:05 AM
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Nope. 2.5 duals sounds right to me for that setup. Any bigger and you might pick up 1-2 hp but it might come at the expense of 5 lb-ft lost in the lower end.

Either way, you won't feel a bit of difference. 3" would sound killer, but it would probably add a ton of interior drone and not really help power.
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Old 05-01-2011, 10:11 AM
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ok thanks alot. didnt see that this was a repost until after i posted.
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Old 05-01-2011, 10:12 AM
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it does matter alot
whats the car being used for, daily driver?
2.5 dual exhaust sounds about right to me also
if you search there is a ton of info on here about it
x-pipes, h-pipes, where to put and what kind of mufflers, etc.

for daily/weekend driver, i would stick with 2.5" pipe, use an x-pipe and some higher quality mufflers
but i dont know what kind of budget you have
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Old 05-01-2011, 10:23 AM
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hey matt thanks for the info, my car is a weekend driver and occasionally i will go to the garage and crank her up just to hear her growl but i will look into the x pipe possibility and my budget is only an issue with the wife
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