GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 10 of 10

Thread: which muffler??

  1. #1

    Question which muffler??

    Ok i am bout to order the o2 simulators so i can remove cats without throwin codes. After i do that im goin to put a muffler on, but there are so many to choose from. the things im lookin for in one is to give it a good deep sound but i still want it to be plenty loud, i just dont want that popping noise since i dont have cats. then i also want one to give some backpressure so it wont kill my torque.
    After doin that im gonna try to get a custome tune from pcm so maby that will help.

    So anybody that has any experience with this or knows anything bout them, please help. Thanx
    1999 Chevy Silverado Z71, single cab short bed
    5.3, K&N cold air intake, Diablo sport predator,
    33" mastercraft mudders, 145,000 miles,
    2.5"true duals, 3'' slash cut tips

  2. #2
    finalday7's Avatar
    Join Date
    Oct 2007
    Sayward, B.C Canada


    Just wondering why your deciding to remove the cats?

    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.

  3. #3


    Removing the cats is gonna take away back pressure and hurt torque. Not to mention no matter where you live and whether or not you have emissions testing removing the cats is a federal crime your commiting that you probably shouldnt be announcing over the internet for the world to see.
    Placing test pipes on wont increase your horsepower. Cats used now days are very efficient and dont hurt performance like they did in the 70's and 80's, manufacturers have done a lot of R&D and in some cases increased horsepower output on engines using cats and emissions equip.
    Just find a new muffler, if your looking for performance try regearing, a Supercharger, or a Turbo.

  4. #4

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    I would say leave the cat, or if your hell-bent get a magnaflow hi-flo cat, like $60-$100 on ebay, and then a magnaflow exhaust, mellow with no cabin drone, but good sound on acceleration and WOT
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  5. #5


    hey, wel the reason im wantin to remove the cats is because im wantin it louder and i was told this would be bout the only way to get it any louder than what iv already got. i dont really want to remove the cats, but i do want it louder, im open for ideas!!

  6. #6

    Join Date
    Aug 2008
    East of Branson, Missouri
    Blog Entries


    Jordan- ever wonder WHY cats are actually on vehicles?

    "The Sarge"
    1999 Chevy Suburban LT- K2500
    7.4 454 Vortec, 4WD
    305/70/16 on Eagle Alloy

  7. #7


    I agree with everyone on this one. Keep the cats, but if you really want to, get some high-flow cats. From what I hear, Flowmaster will make it the loudest. Talk with your local muffler shop and tell them what you are looking for. They will be able to tell you the best set up for what you are wanting. Plus, it will be legal
    Hallsville, TX

    2005 Silverado 1500 LS Crew Cab 5.3L 2WD
    Magnaflow Exhaust
    Hypertech Max Energy Programmer
    Suspension Leveling Kit
    Putco Element Window Visors
    Carriage Works Billet Grille
    TruXedo TruXport Tonneau Cover

  8. #8

    Thumbs down

    keep the cats ..keep it legal!
    and a dumped exaust will be louder than one w tips f.y.i.

    2002 Jeep Wrangler Sport 4x4 (the Yellow Jacket)
    4inch suspension 3inch body
    Straight 6 (383 Stroker within a year)
    36inch SuperSwamper TSL.
    Detroit Loccers
    Daily Driver Weekend Wheeler
    much more...

    2004 Sierra crew cab, 2wd, 5.3 V8
    2inch Daystar Leveling kit
    single dumped Flowmaster 40 sieries exaust(removed)
    Mb Blitz Chrome wheels
    Leer Bed Cover(for sale)
    50k miles

  9. #9
    Jr. Apprentice 06badZ71's Avatar
    Join Date
    Sep 2008
    Hoffman estates Illinois


    i deff. agree with everyone else on this.. keep the cats..if your lookin for a loud and deep sound..for my setup all i did was take off my stock piping and muffler From the 2 into 1 flange after the cats and just ran straight pipe no muffler n i have a nice big slashcut tip coming out the side before the tire on the passanger side..That Baby Screaamss!!and it still growls n pures at u..i love the sound.. i did notice some lose in performance and throttle responce though..another suggestion i would say check out some true dual catback systems with some flowmaster super 44 mufflers..and you can even switch out ur headers for some performance headers..GOOD LUCK WITH YOUR TRUCK

  10. #10


    Yea i guess il prolly just keep the cats and maby look at some high flow cats, but iv heard there pretty exspensive, il look. Thanx for the input everybody and il try to let ya know what i do.

    if any body has some sound clips i wouldnt mind hearin them

Similar Threads

  1. Muffler help
    By stephen115 in forum General Chevy & GM Tech Questions
    Replies: 3
    Last: 03-21-2010, 08:31 PM
  2. Looking at a new muffler
    By 95WT in forum Chevy C/K Truck Forum
    Replies: 0
    Last: 01-14-2010, 03:40 PM
  3. New Muffler
    By Tapper1823 in forum Performance & Fuel
    Replies: 12
    Last: 08-10-2009, 01:40 AM
  4. best muffler for 6.0L
    By drumm14 in forum Performance & Fuel
    Replies: 8
    Last: 06-17-2009, 07:55 PM
  5. New muffler
    By Mmarrocco in forum Performance & Fuel
    Replies: 3
    Last: 06-20-2008, 08:01 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts