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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


    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
    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


    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
    Join Date
    Aug 2007
    fort myers , florida


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

  5. #5


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

  6. #6
    finalday7's Avatar
    Join Date
    Oct 2007
    Sayward, B.C Canada


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

    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


    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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