A New Catback, Need Suggestions
TECH Fanatic
Joined: Oct 2008
Posts: 1,183
Likes: 0
From: VA
But I have to say the Loud Mouth II is quieter than I was expecting. I thought it was gonna be like cutout loud. But no, it's idle is almost perfect for me. It's fairly deep and mellow. Sounds great going through gears and at WOT it screeeeeams. No drone on the highway, but I do have a 6-speed so I'm sure that helps alot.
Last edited by Flaring Afro; Nov 19, 2008 at 02:04 PM.
Thread Starter
Staging Lane
Joined: Jan 2008
Posts: 52
Likes: 0
From: St. Louis, MO
My mechanic friend who helped hadn't ever heard the LM II until yesterday but lots of LMI's. He said he like's it better. It really has no rasp for me at all. But like you I truly am suprised since I have no cats, and headers with ORY.
I was expecting to have to sell it cause it would be too loud. It's definetly not too loud. Maybe not loud enough haha. I'm also curious to see if it will make a tad more power than my stock exhaust. Supposedly that truly wasn't stock on firehawks. It's an SLP aftermarket exhaust. I don't see any SLP markings on it, but it's just what I was told and have read. However I think it may hold back some power. Will see in do time though.
I bought too many F'ing mufflers!!!!!!!!!! FWIW, I run Mac mids, ory and Gibson cat back. I really like it. It's a bit noisy (raspy) under power at 2200 to 2800rpm but cleans up well after that. At same rpm while cruising it is not bad. Got my Gibson for $270 from Jegs. It is not stainless but I only drive 4-5k miles per year in good weather. It sounds excellent up on top.
So, I have run LM1, LM2 and BorlaMouth all on the same headers and ory.
LM1 was friggin' NOISY with headers, ory, cam, heads and intake. If you are concerned about noise, don't go here. LM1 sounds bad *** in the upper rpm's but it's loud.
LM2 sounded better, for a month or two. After that it was just as raspy and almost as noisy as LM1. Still sounded great 4k-6.5k rpm.
BorlaMouth with Borla XR-1 was better for rasp but it was still there and with the muffler right under the passenger seat the drone in the car was horrid at highway speeds.
As mentioned before the Gibson is very nice. I think getting the mufffler out back helped alot.
Don't be swayed by people running LM1 or LM2 with cats and stock manifolds and saying they have no rasp or it's not too loud. They are right, with their setup, but there is an *** load of difference when you have a LM behind headers and no cats.
Good luck!
So, I have run LM1, LM2 and BorlaMouth all on the same headers and ory.
LM1 was friggin' NOISY with headers, ory, cam, heads and intake. If you are concerned about noise, don't go here. LM1 sounds bad *** in the upper rpm's but it's loud.
LM2 sounded better, for a month or two. After that it was just as raspy and almost as noisy as LM1. Still sounded great 4k-6.5k rpm.
BorlaMouth with Borla XR-1 was better for rasp but it was still there and with the muffler right under the passenger seat the drone in the car was horrid at highway speeds.
As mentioned before the Gibson is very nice. I think getting the mufffler out back helped alot.
Don't be swayed by people running LM1 or LM2 with cats and stock manifolds and saying they have no rasp or it's not too loud. They are right, with their setup, but there is an *** load of difference when you have a LM behind headers and no cats.
Good luck!
TECH Fanatic
Joined: Oct 2008
Posts: 1,183
Likes: 0
From: VA
^ yeah, i usually wouldnt recommend it for the reason of it sounding horrible. but some people like me arent ever going to upgrade. i'll never have the money for better performance, and have never drag raced and probably wont more than a few times. then when im out of college, ill want a newer, more reliable car. maybe a used zr1. 
oh at that speed my exhaust is completely silent. people only get in trouble for 90+ here.
oh at that speed my exhaust is completely silent. people only get in trouble for 90+ here.
TECH Enthusiast
Joined: Jul 2007
Posts: 647
Likes: 1
From: new iberia la.
Kooks headrs, y pipe with high flow cats, SLP Loudmouth 1, i think it has a reallly deep rumble and not raspy at all.
JFYI, THE stock exhaust system that comes on Firehawk and Camaro SS is on the General motors dealers parts computers.
JFYI, THE stock exhaust system that comes on Firehawk and Camaro SS is on the General motors dealers parts computers.
Stainless Gibson is $467
http://www.lmperformance.com/16645/1.html
Comes with 4 inch tips, which some may not like but I think it's one of the easier catbacks to have corsa clones put on as another option. Also louder than stock slp dual dual but not quite as loud as a loudmouth.
http://www.lmperformance.com/16645/1.html
Comes with 4 inch tips, which some may not like but I think it's one of the easier catbacks to have corsa clones put on as another option. Also louder than stock slp dual dual but not quite as loud as a loudmouth.
+1 on Gibson. Great product.
Teching In
Joined: Apr 2008
Posts: 13
Likes: 0
From: Minneapolis, MN
Hmm, I was also thinking of Magnaflow. Found a sponser with some on sale. But I was told it isn't much louder than my stock exhaust. I will keep looking and thanks for the input.
I've never heard of gibson. How is it? 4 Inch seems pretty big but it's all relative.
I may end up getting LM II, that's what I've wanted. I know GMMG is awesome but they are pricey. Then again you get what you pay for.
I've never heard of gibson. How is it? 4 Inch seems pretty big but it's all relative.
I may end up getting LM II, that's what I've wanted. I know GMMG is awesome but they are pricey. Then again you get what you pay for.
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