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  1. #1
    Jr. Apprentice
    Join Date
    Apr 2006

    Default upgrading exhaust, anyone done it?

    I thinking of replacing the exhaust on my 1995 K2500. At least a cat back system. Anyone replaced their's with something that sounds good but is not too loud. Truthfully I was thinking of a header muffler in place of the stock muffler and just a single 3" out. My 1989 Chevy has a hole in the pipe just before the muffler and it sounds real good, not loud either.

    This forum looked lonely with no posts.

    BTW, thew 1989 K2500 is for sale see, Craigslist in Allentown PA.

  2. #2


    I had "true duals" with "Flowmasters" on a '96 Silverado I used to have. It sounded good, except for the "drone" inside the cab @ cruising speeds. I did gain some performance, but don't need the interior noise.

    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  3. #3
    Jr. Apprentice
    Join Date
    Apr 2006


    Every car/truck with Flowmasters I've known was loud. My 1989 truck has a Dynomax cat-back on it and was very quiet untill the hole developed in the pipe. If you want real quiet go with a dynomax. I'm looking for something with a little more "sound" to it. I'm just tired of listening to annoying rice burners running around. You just can't beat the sound of a V8.

  4. #4


    I upgraded my 03 Sierra to a single Magnaflow with dual custom bent pipes and long stainless angle cut tips. It sounds very good and I don't get any drone. That's why I didn't do Flowmaster. I call the guys at Summit Racing and they gave me all the information I needed to make the right purchase. I get better MPG and more power too.
    Tony M - Hampton, VA
    2006 Trailblazer SS
    2003 GMC Sierra SLT Ext Cab/LB
    Former vehicles
    2002 Chevy Trailblazer LTZ
    1989 Chevy Silverado Ext Cab/LB
    1976 and 1979 Chevy Cheyenne
    1970 Chevy C10

  5. #5
    Jr. Apprentice sidedrifter's Avatar
    Join Date
    Nov 2006
    Southern Oregon

    Thumbs up 3 Inch

    I have a 3 inch cat back with a Magnaflow on my 99 GMC Suburban and I am more than pleased. I thing it woke it up a fair amount .I know it helped with towing my boat.
    05 Dodge 3500 4x4 DRW quad cab,Cummins,6speed
    99 GMC Suburban SLT 4x4-18's;K&N,Magnaflow
    2000 Jeep TJ work in progress
    06 Willie 17x54 Diamond Addition driftboat

  6. #6


    We've got smog laws here too now...but. Buy dual cats/mufflers of choice. Find the shop in town that'll do custom bending. Shove those 3"ers right out the back (make that ol' 2500 talk dirty to ya) Or bologna cut out either side.
    May I suggest some bady blue Walkers...LOL


    2007 Ford E250(Work van) (Ya, Ya, shut up!)
    1996 GMC Sierra SLE 1500 5.7L/4L60E

  7. #7


    I have a set of Flowtech Ceramic Coated shorty headers for sale. Never installed. I paid around $380 for them a few years ago. Sold my Suburban so I have no need for them. Just taking up shelf space. Make me an offer. They still sell for $329.95 in Summit. Will fit the following:
    8895 Chevy/GMC Truck, 1500/2500, 9295 Suburban, 9294 Blazer/Jimmy, 95 Tahoe/Yukon: 5.0L/5.7L, Tube Size 1.5" O.D., Ceramic Metallic Coating

    Email Smokingreen94z if you have questions.

    I found this post somewhere else if ya want to put headers on. LET's MAKE A DEAL (What is this a game show)
    good luck

  8. #8
    Jr. Apprentice RichardG's Avatar
    Join Date
    Jul 2006
    Boondocks of Oregon

    Default exhaust upgrade

    I put some Doug Thorley headers on my '99 2500 Silverado with a Gibson muffler, no cats and single 4" tailpipe. The engine is an '01 8.1L and the sound is awesome. It drones at 1800 - 2000 RPM in the cab. Too noisy for for my wife so it goes to the muffler shop Tues for some resonators. If it was just me I'd leave it alone but it sets off the neighbors car alarm when I drive by.

  9. #9

    Default Borla with dual 4"

    I put on a Borla exhaust system with 4" dual exhausts exiting right behind each rear tire. Supposed to give me an increase in gas mileage but we'll see. The advertised 20hp boost is evident especially on the low end. To me I'm not used to the resonating growl when I start it up, but I'm slowly getting used to it. By the way, I have a 07 Tahoe, don't know if that was the smartest thing to do but oh well. Would like to know what you think of Superchips flashpaq and what kind of filter is best?

  10. #10


    gibson has a good exhaust system out..iv got it on my truck its an extream duel kit..not too loud..but loud enuff..
    Padraic O'Neill
    1990 Chevy K-1500
    305 5.0L short bed 4x4
    new tune up..synthetic oil only..turbo 400 3 speed trans, 10 bolt rear end just flushed both axles and added royal purple full synthetic gear oil...

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