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Old 02-18-2013, 05:13 PM   #10
thahemp
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Drives: 2012 Black LS3
Join Date: Jan 2012
Location: Derby, KS
Posts: 4,343
Quote:
Originally Posted by jasonpope2003 View Post
mufflers are not straight through.
and backpressure has been proven to be needed.
some open systems actually lose HP..
as Dumps did on the older stangs..
What is the back pressure needed for, and how much older of a stang? I cordially disagree with you here sir.
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