Gmmg owners future and present inside.
Gmmg owners future and present inside. Since my last post did not work for some odd reason, here is a repost.
I just thought I would post up my experience with my gmmg with cats and without them. I have had the Gmmg exhaust with my cme tips now for three years. Up until now, its been with the TTS headers and TTS cats. The car has sounded great, but those TTS cats are robbing way to much power, so since I had to wait 3 months for Exedy to send me a warrantied clutch, I thought I would gut the TTS cats and stick a pipe in each cat to keep a straight flow and eliminate any turbulance. At the same time, I added a QTEC for a louder sound.
To my surprise, the car has just got alot louder with just the gutted cats. I would almost say way louder. The cutout adds sound when open, but not as much as I thought. Now this was all taken in at idle. The car comes off its jack stands tomorrow for a drive (if it don't rain).
Anyways, my point being, the cats made a big difference in the sound and how loud the car is. If you have cats, you may want to keep them. If the gmmg is to loud witout cats, then you may want to add a pair. Though the sound now at idle is deeper and has more thump to it even on my baby 114lsa cam. So far I like. We'll see when I drive it.
I just thought I would post up my experience with my gmmg with cats and without them. I have had the Gmmg exhaust with my cme tips now for three years. Up until now, its been with the TTS headers and TTS cats. The car has sounded great, but those TTS cats are robbing way to much power, so since I had to wait 3 months for Exedy to send me a warrantied clutch, I thought I would gut the TTS cats and stick a pipe in each cat to keep a straight flow and eliminate any turbulance. At the same time, I added a QTEC for a louder sound.
To my surprise, the car has just got alot louder with just the gutted cats. I would almost say way louder. The cutout adds sound when open, but not as much as I thought. Now this was all taken in at idle. The car comes off its jack stands tomorrow for a drive (if it don't rain).
Anyways, my point being, the cats made a big difference in the sound and how loud the car is. If you have cats, you may want to keep them. If the gmmg is to loud witout cats, then you may want to add a pair. Though the sound now at idle is deeper and has more thump to it even on my baby 114lsa cam. So far I like. We'll see when I drive it.
I have LT, ORY, GMMG now and it's pretty loud with my ported heads and F13 on a 112. I gotta change or I will get yanked by the po po and I can't afford another ticket, I was thinking about either going with cats or change the exhaust all together and leave the ORY on. Did you feel a power difference without the cats oppposed to with them?
Originally Posted by Hardtop00SS
I have LT, ORY, GMMG now and it's pretty loud with my ported heads and F13 on a 112. I gotta change or I will get yanked by the po po and I can't afford another ticket, I was thinking about either going with cats or change the exhaust all together and leave the ORY on. Did you feel a power difference without the cats oppposed to with them?
.
Originally Posted by HorsePowerKing
They were on my friends car and yes there was a difference. SOP
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Originally Posted by Brian2001SS
Do you think your gmmg sounds a little different with the cme tips? I think mine does.
Originally Posted by SSDriver
well mine definitly did, before I put my stock CME tips on the exhaust was exiting stright into my bumper cover. LOL
Sure did make a mess of the back of the valance.
Originally Posted by Brian2001SS
Havn't had time to drive it yet. Its still on the jack stands, but I would expect to feel a little more(once the Exedy is broken in). I would try some cats first. I am still amazed on how loud the car has got at idle without out the TTS cats .
.
Originally Posted by Hardtop00SS
Let me tell you without the cats, it sounds BAD ***, but it's LOUD! I wouldn't mind keeping it the way it is, but my parents and my girl's neighbor (one being a county sheriff) isn't too happy with it so I gotta do something with it.
i had my gmmg for a while on stock manifolds and i was kinda dissapointed when i first put it on and thought it was going to be a huge difference 
.........but then i got my lt's and tsp ory and wow it woke the exhaust up! 
....i love the way it sounds....it absolutely screams at wot 
....i love it and so does everyone else...i get so many compliments asking how to get this exhaust
.........but then i got my lt's and tsp ory and wow it woke the exhaust up! ....i love the way it sounds....it absolutely screams at wot ....i love it and so does everyone else...i get so many compliments asking how to get this exhaust
Originally Posted by camaross305
i had my gmmg for a while on stock manifolds and i was kinda dissapointed when i first put it on and thought it was going to be a huge difference .........but then i got my lt's and tsp ory and wow it woke the exhaust up! ....i love the way it sounds....it absolutely screams at wot ....i love it and so does everyone else...i get so many compliments asking how to get this exhaust
.........but then i got my lt's and tsp ory and wow it woke the exhaust up! ....i love the way it sounds....it absolutely screams at wot ....i love it and so does everyone else...i get so many compliments asking how to get this exhaust oh BTW, you guys are making it hard as hell on me, I was planning on switching it out for something quieter, but ya got me all fired up now because of the way it sounds without the cats 