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  1. #1
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    Z71_usmc_rebel's Avatar
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    Default suggestions for a good high flow cat

    what high flow cats are out there that are worth buying? also will a high flow mess with sensor readings? i have the 5.3L..
    Justin - Beavercreek,OH

    02 Z71 Ext. Cab (fully Loaded)
    * 9" Total Lift (RoughCountry)
    * 35' BF Goodrich Mud Terrain KM2s w/ 16" Chrome Pro Comp wheels
    * Hypertech Maxx Energy Programmer
    * K&N Intake
    * BlackOut Tails


  2. #2

    Default

    The stock cats already flow quite well for your average truck. Unless you've got some serious mods, like a Turbo, the stock cat works great. Otherwise Magnaflow/Carsound have some of the more popular aftermarket free flowing cats.

    2009 GMC Sierra Denali AWD

  3. #3

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    Like Omegafiler posted, the stock cats flow quite well.
    Back in the early days factory cats were notorious for clogging and flow issues, over the years these problems have been resolved and if you were to compare High Flow cats against factory cats on a flow test bench you'd find there isnt much of a difference. Many big horse power engines are still running the factory cats.
    Put your money in a cat back system or some other performance improvement like headers.

  4. #4

    Default

    high flow cats are not really worth it like tim said. put the money somewhere else and you'll get more power anyway
    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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  5. #5
    Jr. Engineer
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    Default

    yeah i was thinkin of starting at the headers..but im not sure where i want to start just yet in the performance section..any recommendation on headers?
    Justin - Beavercreek,OH

    02 Z71 Ext. Cab (fully Loaded)
    * 9" Total Lift (RoughCountry)
    * 35' BF Goodrich Mud Terrain KM2s w/ 16" Chrome Pro Comp wheels
    * Hypertech Maxx Energy Programmer
    * K&N Intake
    * BlackOut Tails


  6. #6

    Default

    i have flowtech on my truck cuz they were relatively cheap. headers are headers and the power difference between them is not going to be much between a $300 set vs a $500 set. just get them ceramic coated. i had mine for 4 months before they started to rust and the are not ceramic coated.
    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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  7. #7

    Default

    You need to do a little research on headers before choosing a set. Ceramic coating is a must for long life, but depending on the type performance your wanting you'll need to decide between long tube, short tube or intermediate, they all produce power in different RPM ranges. I probably wouldnt break the bank for a set of headers you should be able to buy a decent set in the $300-$500 range.
    Pace Setter, and Jardan seem to be at the top of the $$ range while Hedman and Hooker are nearer the bottom.

  8. #8
    Jr. Engineer
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    Default

    awesome thanks for the help guys that will def. help me with a decision
    Justin - Beavercreek,OH

    02 Z71 Ext. Cab (fully Loaded)
    * 9" Total Lift (RoughCountry)
    * 35' BF Goodrich Mud Terrain KM2s w/ 16" Chrome Pro Comp wheels
    * Hypertech Maxx Energy Programmer
    * K&N Intake
    * BlackOut Tails


  9. #9

    Default

    I say new headers and a cat back exhaust (mandrel bent piping in a larger diameter than stock).

    2006 Chevy Silverado 1500 2WD EXT Cab
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