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Old 11-26-2015, 03:24 AM   #1
swamp rat
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Join Date: Oct 2007
Location: Spanaway
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Re: New to the forum

Talk to most performance muffler shops and they will tell you that a dual 2.25 system is good for 400HP, beyond that you need to go up to 2.5".

This link has a chart which is based on maximum flow that says 371HP for a 2.25 system, more than just maximum flow tho you need to be thinking velocity as it leaves the engine so a 3" system may be too big, you will need to calculate the estimated HP and then make a decision. Google "exhaust pipe flow rates" and have a good read.

http://www.exhaustvideos.com/faq/how...pipe-diameter/
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Swamp Rat build thread :
http://67-72chevytrucks.com/vboard/s...d.php?t=595019

72 3/4T 4X4
4" BDS Lift
33" BFG's
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