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  1. #1
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    Default Whats the best Exhaust system for my 2007 gxp v8

    Bought my gxp about a year ago and I am looking to upgrade the exhaust system. I am undecided about whether or not to do a complete overhaul or just a cat back system. I greatly appreciate any help!

  2. #2
    GrandPrix Junkie SgtMarshal's Avatar
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    Default Re: Whats the best Exhaust system for my 2007 gxp v8

    http://www.getoverkilled.ca/LS4tech.html

    Looks like there are a couple GXP sound clips on this page:

    http://wbodyexhaust.com/

  3. #3
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Default Re: Whats the best Exhaust system for my 2007 gxp v8

    Pick some mufflers and get them welded in.

    You'll likely wish to remove the AFM/DoD with a tune when you install the exhaust, it will sound like a helicopter and possible drone in 4 cylinder mode.

    SMGPFC Member #1

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    GrandPrix Junkie Bronco Boy's Avatar
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    Default Re: Whats the best Exhaust system for my 2007 gxp v8

    I had a GXP go past me at an intersection the other day. Not sure what the exhaust was, but it was deep, loud and rumbled; made my weiner move a little.
    Chris B
    2002 GT

  5. #5
    GrandPrix Junkie SgtMarshal's Avatar
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    Default Re: Whats the best Exhaust system for my 2007 gxp v8

    If I ever do the exhaust on my gxp, I was thinking I would do a 3" downpipe with a catalytic converter delete, 3 inch pipes with the stock resonator and stock mufflers. I'm not sure if it will work, but that's what I've been thinking about.

  6. #6
    Donating Users Slick2500's Avatar
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    Default Re: Whats the best Exhaust system for my 2007 gxp v8

    Flowmaster 40 series muffler always makes the LS sound tits.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
    Quote Originally Posted by The Sunfire Guy
    Superchargers take away horsepower

  7. #7
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    Default Re: Whats the best Exhaust system for my 2007 gxp v8

    I had two different setups...I had a HFC 3" ZZP DP, into SLP LM2's...and I used an SLP LM1 as a resonator with stock catback piping. Loud as hell. Droned like crazy. Sounded like a truck. Rasp. No bueno. - See here: https://www.youtube.com/watch?v=1AHTsY4TpYo

    Second setup had a catless ZZP 3" DP, still had the LM1 resonator, and switched to Borla Pro XS mufflers. No drone. Much better sound. No rasp. Bueno. See Here: https://www.youtube.com/watch?v=pbE25ajERSU

    Quote Originally Posted by Slick2500 View Post
    Flowmaster 40 series muffler always makes the LS sound tits.
    It does not. All chambered mufflers still sound sh1tty on these cars because of the way the exhaust is setup up front. Nearly as bad as a 3800.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI

  8. #8
    GrandPrix Junkie SgtMarshal's Avatar
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    Default Re: Whats the best Exhaust system for my 2007 gxp v8

    what is HFC?

    if only they could stuff an 8.1 liter engine in these things, I loved the way mine sounded at about 4000 rpm.

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    Admin blueguy's Avatar
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    Default Re: Whats the best Exhaust system for my 2007 gxp v8

    The Vortec 8100 was a towing motor.

    There was nothing power wise coming out of an iron motor from top to bottom without a massive turbo.

    HFC is high flow cat.

    Haven't you been around cars awhile?
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI

  10. #10
    GrandPrix Junkie SgtMarshal's Avatar
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    Default Re: Whats the best Exhaust system for my 2007 gxp v8

    apparently I haven't been around cars enough to know what hfc meant. just never saw it before. the 8.1 was a good towing motor, I liked how it sounded in a rev.

  11. #11
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    Default Re: Whats the best Exhaust system for my 2007 gxp v8

    Those borlas sound really quiet, drop the res and put a powerstick in its place and remove the mufflers.https://m.youtube.com/watch?v=oyLMsvcZXsE

    Sent from my SM-N900T using Tapatalk
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  12. #12
    GXP Level Member SDGTP99's Avatar
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    Default Re: Whats the best Exhaust system for my 2007 gxp v8

    How 'bout the Magnaflow w/ a ZZP DP. Give it an intake & port stuff too. It'll give you a nice noisy rumble that you'll get tired of real fast w no noticeable bumps in power.
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, UMI ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.

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    Default Re: Whats the best Exhaust system for my 2007 gxp v8


  14. #14
    GrandPrix Junkie SgtMarshal's Avatar
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    Default Re: Whats the best Exhaust system for my 2007 gxp v8

    lol at the guy that starts a thread, comes back the next day and does nothing else. I guess it's ok because the thread gave me a few ideas for the future.

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