Big difference in sound with GMMG using stock manifolds vs LT headers + highflow cats
06-16-2006, 09:50 PM
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Big difference in sound with GMMG using stock manifolds vs LT headers + highflow cats OK guys...So, I don't have any sound clip comparisons (deal with it), but a couple nights ago I met up with a buddy so that we could hear each of our LS1's. He has an '02 M6 Trans Am w/ an intake lid & GMMG cat-back/DMH cutout. I have an '02 M6 Z28 w/ an intake lid, GMMG cat-back, & Kooks LT's + highflow catted Y. The headers being the only difference between the two cars.
After getting the chance to hear both cars from the inside/outside at idle, acceleration, WOT, etc...I am AMAZED at how much different (and better) my LS1 sounds through the GMMG than my friend's.
Mine has much more bark at start-up, is noticeably louder/deeper at a warm idle (just rumbles more; can barely hear his, LOL). And when getting on it (especially at full throttle), not only is my car a LOT louder, but it actually has a defined tone that is really distinctive...Just a meaner, deeper roar and not a higher-pitched wail like his.
Anyway, it had been so long since I last had the GMMG w/ stock manifolds & cats on my LS1, I was really surprised at how much different the LT's & higflow cats made the GMMG sound. Honestly, didn't even remotely sound like the same cat-back to me.
Just thought some of you who will be adding LT's + highflow cats to your GMMG set-up would like a heads up
Mike
After getting the chance to hear both cars from the inside/outside at idle, acceleration, WOT, etc...I am AMAZED at how much different (and better) my LS1 sounds through the GMMG than my friend's.
Mine has much more bark at start-up, is noticeably louder/deeper at a warm idle (just rumbles more; can barely hear his, LOL). And when getting on it (especially at full throttle), not only is my car a LOT louder, but it actually has a defined tone that is really distinctive...Just a meaner, deeper roar and not a higher-pitched wail like his.
Anyway, it had been so long since I last had the GMMG w/ stock manifolds & cats on my LS1, I was really surprised at how much different the LT's & higflow cats made the GMMG sound. Honestly, didn't even remotely sound like the same cat-back to me.
Just thought some of you who will be adding LT's + highflow cats to your GMMG set-up would like a heads up
Mike
06-16-2006, 10:02 PM
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No problem! And the other really interesting peice of info regarding that night (I'm sure my buddy will have no problem verifying that if he catches this thread)...The GMMG & DMH cutout (when open) on his '02 Trans Am sound a lot like (I'm literally not kidding). The cutout was louder at idle and throughout the rpm range, but seriously, I could hardly tell any difference when he revved his car up through both of them...Or when he was driving around, going WOT, etc. He kept telling me both sounded the same and I didn't believe him, but damn...They really did sound very similar outside the car...
Let's just say he wants some Kooks LT's real bad now...
Let's just say he wants some Kooks LT's real bad now...
06-16-2006, 10:37 PM
#5
Awesome post. I'm hoping to get my Kooks installed the first week of July. Weekends get booked in June with graduation and birthday parties and all sorts of other crap that I can't ditch. 
Soon though, my GMMG will have the Kooks going on upstream. I can't wait.
Soon though, my GMMG will have the Kooks going on upstream. I can't wait.
06-16-2006, 11:09 PM
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Originally Posted by orangeapeel
Birthday parties? Are you 13? 
Nothing is more important than putting more parts on your car. Nothing.
Nothing is more important than putting more parts on your car. Nothing. I'm not sweating it. Just giving ya a hard time. Though that word "Nothing" has some strong meaning there Boss. I can think of quite a few things in my life that top that "Nothing". I'd have some doubts about someone who put their car ahead of family. But to each his own.....
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06-17-2006, 09:08 AM
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Originally Posted by orangeapeel
Either car cammed?
06-17-2006, 09:11 AM
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Originally Posted by Z2K_MrJ
WHy dose he RUn a CUT Oout?? Hopefully he did not have it opne on the test HEHE..
If my friend (TORCH'D 02 TA) sees this thread, I'm sure he'll post up and answer that.
06-17-2006, 02:03 PM
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Originally Posted by 89KARR
..I'd have some doubts about someone who put their car ahead of family. But to each his own.....
