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Re: Project 68 k10 LWB..aka "The Hulk"
I never ran 3" pipe but i had 2 1/2 duals and my truck is estimated at 325hp, i went to get it re-dueled and both the performance places i went to said that with duals 2 1/4" pipe will flow fine up to 400HP any larger and your taking away bottom end, which tells me that 2 1/2" duals will probably accommodate about 5-550 HP.
Google this and you will find calculators for pipe size, maybe a page or tow that talks about the subject.
"exhaust pipe diameter and flow rate"
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