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Gmmg, stock manifolds, no cats

This is a discussion on Gmmg, stock manifolds, no cats within the External Engine forums, part of the LSx Technical Help Section category; Hi. Pretty soon I am going to put a Gmmg catback on my car. Eventually I am going lt's and ...

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    Gmmg, stock manifolds, no cats

    Hi. Pretty soon I am going to put a Gmmg catback on my car. Eventually I am going lt's and an ory; however, that won't be untill later next year. In the meantime I was wondering how would stock manifolds with no cats and the gmmg sound. I would put a bullet in the i-pipe, but was wondering if it would still be raspy even though it's on stock manifolds, with no cats, and a bullet in the i-pipe. Also what are some different bullets I should use. I was thinking sweet thunders, magnaflow, or flowmaster 1-chamber.

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    member since may 2000 nhraformula's Avatar
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    bullets will change the tone a bit but rasp will still be there
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    Member 01camaross's Avatar
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    i have Lt's and ORY going to my gmmg and it sounds good, very loud but not too much rasp. I think you will be alright to just try it and if you don't like how it sounds you can always add a bullet

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    i have LT catted Y its raspy but it sounds good.!
    M6, Lid, Ported and Polished Throttle Body (By Me!), LT, Custom Catted Y, Electric Cutout, PHB, LCA13.21@108 with a 2.3 60'

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    I was wondering though would the rasp differ from stock manifolds to Lt's or does rasp just depend on cats

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    I'd like to start off by stating I don't consider myself an expert on the subject but in my opinion I think the biggest deciding factor to rasp is cats, I'm ORY and the rasp is there, however, LT's also add to it. As for a previous comment about someone stating that bullets do not get rid of rasp I completely disagree with this comment. I've seen this done and it helps what I intend on doing is putting a borla bullit, they have the cleanest sound out of any exhaust. Although do expect a considerable volume reduction aswell. This is only my personal experience with Borla bullits i would expect other brands such as magnaflow and slp to not do such a good job of cleaning the sound as borla.

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by Bouvs View Post
    I'd like to start off by stating I don't consider myself an expert on the subject but in my opinion I think the biggest deciding factor to rasp is cats, I'm ORY and the rasp is there, however, LT's also add to it. As for a previous comment about someone stating that bullets do not get rid of rasp I completely disagree with this comment. I've seen this done and it helps what I intend on doing is putting a borla bullit, they have the cleanest sound out of any exhaust. Although do expect a considerable volume reduction aswell. This is only my personal experience with Borla bullits i would expect other brands such as magnaflow and slp to not do such a good job of cleaning the sound as borla.
    i tried the whole bullet thing because i have a cam, long tubes and catless y pipe. it changed the tone somewhat, but rasp was still there.

    i changed to a hooker catback, rasp was gone.

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    Quote Originally Posted by 01camaross View Post
    i have Lt's and ORY going to my gmmg and it sounds good, very loud but not too much rasp. I think you will be alright to just try it and if you don't like how it sounds you can always add a bullet
    Same setup as me, I get rasp around 2400-2600 but sounds great before and after that.
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    which cat-back did you have on before? maybe thats whats making the difference, the borla bullet that cleared up all the rasp on the car I'm talking about had corsa cat-back.

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    member since may 2000 nhraformula's Avatar
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    had the magnaflow

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    Member 180ls1's Avatar
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    if you want deep sound the 1 chamber flowmasters are really deep sounding and still flow well. a resonator type bullet will all be the same just about so just go with the dynomax ones they are the cheapest. but if you have the money i would go with the borla xr-1 mufflers they are extremely good flowing and still provide more torque then bullets

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    Member ApexVIII's Avatar
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    Quote Originally Posted by Deaton52 View Post
    I was wondering though would the rasp differ from stock manifolds to Lt's or does rasp just depend on cats
    yea and the style of the muffler

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