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  1. #1

    Question Chevy Silverado NBS - I have an exahaust question.

    just a quick question..i have a 2007 NBS silverado crew cab..5.3 with active fuel management,go from 8 cyl to 4 cyl...

    question is-> can i put an aftermarket performance muffler(other than GM) without having problems with the fuel management acting up?? was told i couldn't do this,cause it caused the 8 to 4 mode to act up..any info on this would be helpful..Thanks

    David

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