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Thread: Longtubes+stock muffler,restrictive?

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  1. 04-12-2010 10:40 AM #1
    6.0vortecchevy's Avatar
    6.0vortecchevy
    6.0vortecchevy is offline Senior Member
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    Quote Originally Posted by jake_03 View Post
    I saw a dyno test on a 5.3 were they replaced the stock muffler with a flowmaster and lost 3rwhp,cut that off and welded up a Magnaflow and picked up 9rwhp over stock,12 hp over flowmaster.
    Yea and I saw the tornado make 15 more hp on the dyno to lol.
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  2. 04-29-2010 11:21 PM #2
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    Chris092183
    Chris092183 is offline 07vtssilverado
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    Quote Originally Posted by 6.0vortecchevy View Post
    Yea and I saw the tornado make 15 more hp on the dyno to lol.

    haha lmao
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