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  1. #1

    Default best hi-flow cats?

    Whats the best hi-flow cats for the money/cheaper. and headers.

    I have a 2000 5.3 with true duals no mufflers out at 65 degree angles. are hiflow cats and headers going to make a sound difference?
    2000 Silverado, 3" body lift with 2" rear block in rear and torsion bars cranked up front. Westin bull bar, 35" Mickey Thompson Baja ATZ. 2 3/4 true duals no mufflers to 4" stainless tips at 65 degree angle, smoked tailights, led lightbar, black halo headlights.

  2. #2

    Default

    best hi-flo cat id go magnaflow.... I have flowtech shorty headers and they are nice and wont break the bank... you will prob get a little louder and deeper sound with the combination of the two also
    PETE
    95 GMC Sierra 2500
    3" Body Lift, 33" Goodyear MTR's
    5.7L 350 TBI Edelbrock SDT Exhaust, Flowtech Headers, K&N Intake
    Sold :(
    1999 Jeep Cherokee, 3" Rustys lift, 33" BFG MT's, locked, armored: Rolled :(
    2000 Jeep Grand Cherokee Limited. K&N Intake, Custom Kolak Exhaust


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  3. #3

    Default

    Magnaflow is the way to go for cats. Not sure about any specific brand of headers, but I'd just go for the long-tube headers. You'll see much more noticable gains. They also cost more, of course.

    2009 GMC Sierra Denali AWD

  4. #4
    Jr. Engineer black jack's Avatar
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    Default

    Ive got slp on my 05 gto and i like them havent changed the ones on my truck yet.

  5. #5

    Default

    about how much does a set of magnaflow hiflow-cats cost?

  6. #6
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    finalday7's Avatar
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    Sayward, B.C Canada
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    Default

    The magnaflow cats are about 65 bucks a piece from summit.

    KRIS
    2007 GMC Sierra CrewCab 4.8L
    Tinted Windows, 20" Chrome MB Predators on 275/55/20 Copper AT's, GM Bed Rug, Speed Scene Chrome Grille, Putco Chrome Handles, Hypertech Max Energy Programmer, Magnaflow Muffler and many more mods to come.
    Former GM Vehicles:
    96 Chevy Camaro. My first car modded for a High School kid.

  7. #7

    Default

    Does replacing for hi-flow cats make a big difference, or should one invest in new piping?

    2006 Chevy Silverado 1500 2WD EXT Cab
    4.3L V6 Vortec, K&N Drop-In, Flowmaster Super 44,
    3" Exhaust tip, 22" Boss #331 Rims, Clifford 50.5x Alarm,
    Escalade Gauges, DJM Leveling Kit, Billet grill, All JL Audio Speakers,
    300XD MTX amp, Two 10" Alpine SWE-1042 subs

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