Thread: New exhaust on my '05 GXP, still loud

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  1. #1 New exhaust on my '05 GXP, still loud 
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    Hey all,

    I just put a new SLP exhaust on my '05, because the old one was trashed. Only thing is, it is still pretty loud and annoying. The SLP did not come with a resonator, so I'm wondering if it's because this is missing, or maybe the cat converter is shot, that's why it's still loud. Any thoughts?

    Thanks in advance!
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  2. #2 Re: New exhaust on my '05 GXP, still loud 
    Killa Bee Scottydoggs's Avatar
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    slp is kinda loud, but it needs the res. get a glass pack and have a shop install it just past the cat on the other side of the flange.

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  3. #3 Re: New exhaust on my '05 GXP, still loud 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    I'd buy a vibrant ultra quiet resonator and have it installed, they work far better than a glasspack at removing drone/rasp from the exhaust while keeping all the sound you want there when you want it.

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  4. #4 Re: New exhaust on my '05 GXP, still loud 
    I live here. stealthee's Avatar
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    You might have a hole in the downpipe, so maybe that's why replacing the catback didn't help.


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  5. #5 Re: New exhaust on my '05 GXP, still loud 
    GrandPrix Junkie ItHurtz's Avatar
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    Your problem is SLP, you want quiet get a dyno max super turbo.
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  6. #6 Re: New exhaust on my '05 GXP, still loud 
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    Thanks for the info guys! I've been checking on Vibrant's resonators, but I can only find ones without a flange. SLP's system has a short flanged pipe that is about 16" long, and I would imagine this is what would be replaced by the resonator, correct?
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  7. #7 Re: New exhaust on my '05 GXP, still loud 
    GrandPrix Junkie spazzz's Avatar
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    My 2.5 SLP catback is still loud after adding a Magnaflow res. Quieter and less drone but still on the fart side of things
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  8. #8 Re: New exhaust on my '05 GXP, still loud 
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    Quote Originally Posted by spazzz View Post
    My 2.5 SLP catback is still loud after adding a Magnaflow res. Quieter and less drone but still on the fart side of things
    Did you have to modify anything at all? Like length of any pipes?
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  9. #9 Re: New exhaust on my '05 GXP, still loud 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    All vibrant resonators are weld in or clamp in.

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  10. #10 Re: New exhaust on my '05 GXP, still loud 
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    Quote Originally Posted by paulhunde View Post
    Did you have to modify anything at all? Like length of any pipes?
    I have a compg not gxp. I was just commenting on tones of SLP

    your catback should be the same though. My muffler guy just cut and welded in Magnaflow.
    Who would do the work on yours?
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  11. #11 Re: New exhaust on my '05 GXP, still loud 
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    Quote Originally Posted by paulhunde View Post
    Hey all,

    I just put a new SLP exhaust on my '05, because the old one was trashed. Only thing is, it is still pretty loud and annoying. The SLP did not come with a resonator, so I'm wondering if it's because this is missing, or maybe the cat converter is shot, that's why it's still loud. Any thoughts?

    Thanks in advance!
    It's loud because of the lack of deadening in the SLP's and the lack of the resonator as well.

    Put a 3" catted downpipe in it and toss in a resonator. It'll help it all out. Been there, done that.
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