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

GMMG with or without cats.

Old Jun 28, 2005 | 02:19 AM
  #1  
LT1 POWR's Avatar
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GMMG with or without cats.

Would you guys recomend using cats with GMMG. Is there any rasp at all. Im not really worried about how loud it would be.
Old Jun 28, 2005 | 09:59 AM
  #2  
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Re: GMMG with or without cats.

no cats
Old Jun 28, 2005 | 10:11 AM
  #3  
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Re: GMMG with or without cats.

I can't speak for the God of catbacks, but I know I have the worst rasp combo. 80 series flowmaster with no cat. My rasp all but went away when I switched to long tubes. If emissions are not a problem, I say go without cats. I like a little rasp in mine, just that the old setup was horrible.
Old Jun 28, 2005 | 10:30 AM
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Re: GMMG with or without cats.

I'm getting one soon, and I will be running it with my Mac headers and ory, if it's to loud or annoying I was thinking about switching to kooks long tubes with a catted-y pipe, when I do my hotcam.
Old Jun 28, 2005 | 11:27 AM
  #5  
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Re: GMMG with or without cats.

I have heard different things about it, some people say without cats and stock manifolds it is really raspy and horrible. Others with longtubes and no cats say it sounds just sick. There is a guy around town with no cats and it sounds like ***, i just hope when i do my longtubes with no cats it will sound good.( i have gmmg on my car) If not then i will just have a custom y pipe with cats made.
Old Jun 28, 2005 | 01:51 PM
  #6  
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Re: GMMG with or without cats.

If you have LT's you'll want the cats. I just put the GMMG on my 396 this past wkend and it sounds really deep w/ the cats. Only problem is I'm melting the cats so I'm running OR pipes on my FLP's. Sounds a little hollow but the rasp is mild and bearable for now.
Old Jun 28, 2005 | 01:57 PM
  #7  
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Re: GMMG with or without cats.

ill let u know as soon as i get my headers on
Old Jun 28, 2005 | 02:37 PM
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Re: GMMG with or without cats.

No cats most definitely
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