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  1. #1 problems after header install 
    yzboy85
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    Default 10-13-2014
    I just got done installing SD headers in my car and have noticed about a 4 mpg drop from what I would normally expect to be seeing. Is this just something I have to live with, maybe something to do with being catless, or is something else going on?
    Last edited by yzboy85; 10-13-2014 at 02:04 PM.
    02 GTP Coupe - Jennifer
    SD headers, SLP Powerflo catback, 3.4, CAI, Shift Kit, GMPP Sway Bars, F-Body Brakes
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