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  1. 4 into 4 headers vs J pipes

    by
    R Thomas
    , 03-04-2017 at 04:48 PM
    [QUOTE=Gordon Levy;270206]On the dyno the difference between the J pipes and 4 into 4's on a 347 was 75 rwhp.[/QUOTE]
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  2. 4 into 4 headers vs J pipes

    by
    R Thomas
    , 03-04-2017 at 04:47 PM
    [QUOTE=Jeff Kleiner;270076]What engine? Coyotes are quiet anyway if that's what you are going to be running. Engine type and specs are generally the determining factor as far as noise level. All things being equal I think the sound level is pretty similar between the J and 4X4 since they're going through the same muffler either way.

    Jeff[/QUOTE]
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