guys with gmmg come in..
Tech Resident
Joined: Jan 2006
Posts: 5,117
Likes: 3
From: Philly
gmmg is basically a tuffed up, ribbed straight pipe. it'll basically be louder than a muffler but not as loud as straightpipe. so yea, it's pretty loud in comparison to say, magnaflow, corsa, borla, hooker...the only exhaust louder is SLP LM1, but it'll sound a lot better. SLP LM1 in my opinion is one of the worst sounding, ugliest exhaust setups out there. i'd go as far to say an LS1 with a LM1 is one of the worst sounding V8's out there, sorry guys, no offense. like, it doesn't sound a whole lot better than my 6'er. gmmg is your best loud/sound combination with the exception of true duals.
Teching In
Joined: Jun 2002
Posts: 7
Likes: 0
From: Atlanta, Ga
Originally Posted by mike1989
i did a search but didnt find much. i want to know how loud gmmg actually is compared to other cat backs.
thanks in advance.
thanks in advance.
), the GMMG Chambered exhaust is THE sweetest sounding cat back for the LS1, hands down. Quite loud, but not enough to really **** off the neighbors. But that sound, man oh man! Sweet thunder! I liked to compare it to WWII fighter planes. Toss the stereo if you go GMMG, you will not need it, LOL! Trending Topics
gmmg owner here. best cat back for ls1 IMO. add longtubes and it sounds like **** if you go with off road y pipe. gets way too raspy and sounds like a rednecks truck runnin down the road. i hear it sounds good with catted ory tho( the route im going sooooon)
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(too quite for me) 
get tsp true duals if you want to **** them off, my friend has them on his 96 1le with lt's,ypipe,and mail order tune, with msd ignition. the thing sounds sick i love it i know when hes coming over my house, you can hear him few blocks lol.
Best catback IMO. While I got the GMMG first, I've heard other LS1s on stock manifold and stock cats with different catback systems that don't sound nowhere near as good as my car. I'm waiting to put LTs in, but on stock mani/cats, GMMG is downright AWESOME.
I love the way my GMMG sounds through longtubes and cats. It's a little on the loud side for me, at idle and WOT. It just makes me a little nervous when I pull up alongside a cop. It does sound great though, with little to no drone at all. It's not too loud in the cabin, but from the back it's LOUD!!