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  1. #1

    Default Headers with cat-back?

    I have a 2001 Chevy Silverado 1500 with dual cat-back exhaust (high-flow cats) and no mufflers on a 4.8 liter V8. I have been considering buying headers for this truck thinking it will improve sound as well as gas mileage and some power gain. Some of my friends have mentioned a possibility of not having enough back-pressure with there being no muffler and the cats being high flow, the concern is that with the addition of headers the decreased back-pressure would cause problems such as burning valves, etc. I was just wondering if anyone could shed some light on this issue for me? thanks for any help

  2. #2


    Welcome to the club. I would install long tube headers and reinstall the mufflers, Magnaflow, flowmaster etc.....

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.

  3. #3


    so you think that headers with just the cats would not provide enough back pressure?

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