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Thread: high flow cats

  1. #1

    Default high flow cats

    im lookin into putting headers on my turck, and i know i should go with some high flow cats, but i cant afford then right now, how bad is it to stick with stock cats vs high flow cats? and can anyone recomend a set of headers they like or some good deals on any?
    05 silverado 1500 4.8L v8
    Flowmaster exhaust
    Dougs headers electric cut out
    AEM brute force intake
    Superchips flashpaq tuner
    Airaid throttle body spacer
    kmc enduro beadlocks
    33 inch hankook dynapros
    4 inch cst lift spindles, rancho 5000 shocks

    "if your not livin on the edge, your takin up too much room"

  2. #2
    Sr. Apprentice _BT_'s Avatar
    Join Date
    Nov 2008
    Newark, CA


    Gravana Tuning in Santa Clarita has headers, here's a link

    If you dont go with a high flow cat, my guess is that you will only be cheating yourself out of 5 hp at the most.
    2009 Sierra 1500 SLE Ext Cab 4x4 5.3L 3.73 gears Steel Gray
    20" Liquidmetal Magmas
    275/55/20 CooperZeons
    Gibson catback
    Diablo Sport tuner
    ReadyLift 2.25" leveling kit
    Volant CAI
    Bed Rug
    Billet grille

    2004 Pontiac GTO - Long Tube Headers,CAI, Magnaflow catback, Comp custom grind cam, Pedders Suspension, GMM race shifter - 392 whp

  3. #3


    ok so not putting on high flow cats isnt gonna mess my engine up then right?

  4. #4
    Sr. Apprentice _BT_'s Avatar
    Join Date
    Nov 2008
    Newark, CA


    no not at all.

  5. #5


    alright thanks alot!

  6. #6


    No, they just improve flow. Go for it.

  7. #7
    Jr. Apprentice
    Join Date
    Feb 2008
    Bossier City, LA


    When I was getting my exhaust done the guy told me high flow cats weren't worth it because the gain wasn't worth the cost. He said the ones on newer vehicles flow really well, I kind of have to belive him because he lost a couple hundred on that sale.
    2004 Silverado Z71 Ext Cab
    295x70x17 NITTO Terra Grappler
    Dual Exhaust
    K&N Intake
    Descreened MAF (bad idea jumpy mpg)
    Hypertech programmer

  8. #8
    Legend cascott325's Avatar
    Join Date
    Aug 2008
    Lawrenceburg, Kentucky


    im getting my exhaust done, and i've ordered magnaflow high flow cats for $80 a piece off the gravana tuning. i was going to go with pacesetter, but that was WAY too much
    2000 silverado with a 5.3l v8, shorty headers, upgraded plugs, 10 mil wires, magnaflow high flow cats, flowmaster 80 series muffler(2 in 2 out) w/ 18 inch stainless silverline tips. i have a k&n CIA. its a 4x4 z71 offroad package. Ls model.
    extended cab 160k miles, truxedo low profile bed cover, diablo sport predator tuner.
    reman tranny @ 130k miles

  9. #9


    Hey Npverhey1 i found a website called this is where i buy all of my stuff for my truck they basically have everything and the website is setup great. They always have sale's and most the time get $20-$25 off anything over $150 or more with free shipping on everything. I found a good set of Pacestter Long Tube Header's for only $274.92 and this is a good brand. The header's are the Black one's but i plan on buying high temp. paint and coating them allot to make sure it doesn't burn off ha. If you buy from this site wait and look online at the top of page to see if the sale is going on and get $20 bucks off so you will only pay $255 for a set of long tubes with free shipping that's fast! I hope this help's you ouy because everytime i buy from this site i'm amazed and am 100% satisfied.

    2008 Chevy Silverado Ext. Cab Lt Z71 5.3 V8
    7.5 Inch Rough Country Suspension Lift
    RBP Replica Grille Black w Chrome Rivets
    Recon Smoked Cab Roof Lights
    N-Fab Powdercoated Gloss black Cab Length Nerf Steps
    5% Tint over 20% all the way around / 5% Eyebrow Strip
    AVS Smoked Window Visors
    Z71 Stickers Black & Metallic Silver
    Tow Mirrors / Smoked Turn Signals
    XM Satellite Radio Fin / Color Matched
    Interior Plastic Pieces / Color Matched
    Power Acoustic Tweeters
    Painted Bowties / Color Matched
    Painted Door Handles / Color Matched
    Smittybilt Bull Bar / Color Matched
    Custom Rolled Edge Exhaust Tips / Color Matched
    Custom 2.5 Inch Cat Back True Dual Exhaust
    Flowmaster Super 40 Series Dual in / Dual out
    Magnaflow Tru-X Pipe
    K&N Air Filter
    18x9 Rockstars Machined Black
    Center Caps / Color Matched
    33.13.50 Nitto Terra Grapplers
    New Front Wheel Well Liners
    Eagle Eye Black L.E.D. Tailights
    Eagle Eye Black L.E.D. Third Brake Light / Smoked
    Eagle Eye Black L.E.D. Halo Projector Headlights
    Notto HID Kit 10,000k Low beams
    Recon L.E.D. Light Bar
    Buschwacker OE Style Tailgate Cap
    AMI Gloss Black Antenna
    Debadged Chrome Lettering
    Door Molding Removed

  10. #10
    Master Mechanic clgoch187's Avatar
    Join Date
    Aug 2010
    Gettysburg, Pennsylvania, United States


    stock cats are hight flows, but you wont be able to use them on long tube headers unless you cut and weld them in, or weld a flange onto them....and your wasting your money if you go with shorty headers
    03 Silverado 1500
    285/75/16 BFG's
    2 Blaupunkt 10" vW1000 subs in Subthump box
    ProComp Level Lift & 3" rear blocks

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