LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

GMMG install problems.

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Old 03-16-2005, 05:06 PM
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GMMG install problems.

I went to install my gmmg catback this afternoon, and the hangers dont line up very well at all. The exhaust will be tucked up way too high if i slide the hangers in. I was thinking about shimming them down with some washers or something, but im not sure if it will be enough. Has anyone else had this problem?
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Old 03-16-2005, 05:46 PM
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Re: GMMG install problems.

which hangers, in the back? by the tips?
i never had any problem with mine, sorry that doesnt help though
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Old 03-16-2005, 07:25 PM
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Re: GMMG install problems.

I'd like to help but I had to fab mine to fit from an LS1 to my LT1. I just stole the stock hangers off my stock catback and bent them to fit my needs. Is it just the rear two or the third by the PHB also?

-Dustin-
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Old 03-16-2005, 07:30 PM
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Re: GMMG install problems.

Originally Posted by Bersaglieri
I'd like to help but I had to fab mine to fit from an LS1 to my LT1. I just stole the stock hangers off my stock catback and bent them to fit my needs. Is it just the rear two or the third by the PHB also?

-Dustin-
Yes its just the rear ones, the catback wants to sit way too high, and the bent peice of steel that is used on the passneger side isnt even close. Maybe its possible that i was sold the LS1 version I still have the stock catback, maybe i can rig something up.
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Old 03-16-2005, 08:43 PM
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Re: GMMG install problems.

theyre all the same
ls1, lt1, it's still the same catback
i think i do remember pulling down on the mufflers to get the tips just right (actually, just pulling on one side to get them level)
yea, i'd do what dustin said and just try the stock hangers, maybe it'll work
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Old 03-16-2005, 08:58 PM
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Re: GMMG install problems.

I think thats what ill have to do, It wants to tuck up so high that its right afainst the heat sheilds, and i dont even have both sides hung yet. Ill figure something out i guess. Thanks for the help guys.
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Old 03-16-2005, 10:13 PM
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Re: GMMG install problems.

my drivers side tailpipe was higher than the passenger b/c of teh hangers , i shimmed it with washers and it came out just fine
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Old 03-16-2005, 10:18 PM
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Re: GMMG install problems.

Originally Posted by CamaroSS30thAnn
my drivers side tailpipe was higher than the passenger b/c of teh hangers , i shimmed it with washers and it came out just fine
How much did you have to shim it, that was my original plan. Ill give it a shot.
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Old 03-16-2005, 10:23 PM
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Re: GMMG install problems.

Not sure if they are universal, but mine was used off a LS1 so I had to mod it a bit to fit the way I wanted. Originally it wanted to push the tips against the bumper. 2 Stock hangers, welding, grinding and a pry bar later, it works great. Good luck.

-Dustin-
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Old 03-16-2005, 10:30 PM
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Re: GMMG install problems.

Originally Posted by Bersaglieri
Not sure if they are universal, but mine was used off a LS1 so I had to mod it a bit to fit the way I wanted. Originally it wanted to push the tips against the bumper. 2 Stock hangers, welding, grinding and a pry bar later, it works great. Good luck.

-Dustin-
Thats basically what mine wants to do. i think im either going to shim the hanger, or make a bracket to let it hang lower. I dont really wanna start welding onto this beautiful catback. It really is a work of art
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Old 03-16-2005, 10:58 PM
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Re: GMMG install problems.

Originally Posted by 95_LT1_6SPD
How much did you have to shim it, that was my original plan. Ill give it a shot.
say half an inch on teh driver side, maybe 3/4 cant really remember. couldnt do it too much or i wouldnt be able to bolt it back up lol
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Old 03-16-2005, 10:59 PM
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Re: GMMG install problems.

Originally Posted by CamaroSS30thAnn
say half an inch on teh driver side, maybe 3/4 cant really remember. couldnt do it too much or i wouldnt be able to bolt it back up lol
That sounds like mine. Ill give it a try. Im thinking of just building a little block to adapt it to make the hanger hang lower and make it work.
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Old 03-16-2005, 11:58 PM
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Re: GMMG install problems.

They sell hangers for the LT1 when buying their system. The LS1 hangers are different. Just for future reference when someone wants to buy their exhaust for the LT1. 20 bucks for the kit.
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Old 03-17-2005, 03:41 PM
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Re: GMMG install problems.

we did get the lt1 kit, all the hangers for the lt1 etc, the only thjing is the way tha hagar holds the rubber piece the exhaust on the driver ide eems to be up slightly higher, its not a big thing just some ppl like are **** about things lol
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