Is There A Catback With 0 Rasp????
TECH Regular
Joined: Nov 2001
Posts: 415
Likes: 0
From: San Diego, Ca / Tucson,AZ
Another vote for the GMMG and I dont even own the GMMG system.
?!?! Thats the funniest thign Ive ever heard. 
Oh yeah the Loud Mouth has no rasp either. 
Borla wide open with no cats and LT's has no rasp.....
Oh yeah the Loud Mouth has no rasp either. 
TECH Regular
Joined: Feb 2003
Posts: 430
Likes: 0
From: Pasadena, CA
Originally Posted by Trans Am WS6 RGS
Another vote for the GMMG and I dont even own the GMMG system.
?!?! Thats the funniest thign Ive ever heard. Oh yeah the Loud Mouth has no rasp either.
?!?! Thats the funniest thign Ive ever heard.
Oh yeah the Loud Mouth has no rasp either. I can only comment on the systems I'm familiar with.
I had an slp 2otl and it had a really bad rasp when I removed the cats. With the cats it was OK.
I went to a hooker (still no cats) and it was nearly rasp free. I added a bullet in the I and the rasp is gone.
The worst ever is my friends ws6 with a Borla, headers and no cats.
I had an slp 2otl and it had a really bad rasp when I removed the cats. With the cats it was OK.
I went to a hooker (still no cats) and it was nearly rasp free. I added a bullet in the I and the rasp is gone.
The worst ever is my friends ws6 with a Borla, headers and no cats.
On The Tree
Joined: Feb 2002
Posts: 197
Likes: 0
From: Houston
Originally Posted by 16nrollininaws6
You are kidding right? I heard that in person and it was one of the raspiest set-ups I have heard. Even with stock everything @ wide open it was raspy at low-mid RPMS. GMMG, Hooker, and Magnaflow have no rasp, just a clean rumble and a refined sound. Flowmaster doesnt either, but it is a piece of **** cat-back as far as performance goes.
nope not kidding at allllll...... haha just playin
i have that setup minus the headers and it is still raspy as hell, but i like it so its all goood On The Tree
Joined: Feb 2002
Posts: 197
Likes: 0
From: Houston
Originally Posted by Trans Am WS6 RGS
Another vote for the GMMG and I dont even own the GMMG system.
?!?! Thats the funniest thign Ive ever heard. Oh yeah the Loud Mouth has no rasp either.
?!?! Thats the funniest thign Ive ever heard.
Oh yeah the Loud Mouth has no rasp either. 
yes especially with no cats it sounds real clean and refined 
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
11 Second Club
Joined: Feb 2003
Posts: 5,524
Likes: 1
From: The South
Have you ever heard the B&B? i don't think it had any rasp when I heard one not that long ago.....not sure if car had cats though.
Duals with crossover give the best sound...and for the price of an expensive cat-back plus a Y-pipe I'd just get duals
Duals with crossover give the best sound...and for the price of an expensive cat-back plus a Y-pipe I'd just get duals
TECH Addict
Joined: Feb 2004
Posts: 2,826
Likes: 0
Anybody have some sound clips of rasp? I have this buzzing noise and almost a rattle when I first start the car. The buzzing noise is about 1500-1700 rpms, but you can't really hear it with the windows open. The exhaust is not touching any heat shields...but could it be making them vibrate that much? I have the Flowmaster catback.
If it were rasp it would be more audible with the windows open right?
If it were rasp it would be more audible with the windows open right?
I've had 4 exhaust cat backs with headers and no cats, and the ONLY thing that got rid of it for me was bullets in the y-pipe ( where cats would be ). A bullet in the i-pipe would work too; I have 3-1/2" exhaust so fitting a bullet in the i-pipe was too big for me, thus in the y-pipe. FWIW.
Originally Posted by racrx
slp dual dual, no rasp at all...none, I have longtubes and no cats. racrx
I run the SLP D/D, with LT's AND cats and I definitely hear rasp. Its not bad, but its definitely noticable.
Perhaps there's some persons in this thread that doesn't know what rasp is???
TECH Fanatic
Joined: Nov 2001
Posts: 1,098
Likes: 0
From: I-L-L-I-N-O-I-S
Guys, this is not difficult... 
ANY LS1 F-body running a no cat Y-pipe set-up will have some raspy/poppy sounds to it no matter what cat-back system it is going through. It's just that some systems like the SLP dual/dual or Hooker only have a little rasp this way while others such as the Borla, SLP Loudmouth, Flowmaster, or cutouts have a ton of raspiness in their tone. And most of the other cat-back options out there are somewhere in between the exhausts I just mentioned. Putting a Dynomax Bullet Muffler in the I-pipe will help some, but doesn't get rid of it entirely.
The ONLY way to basically have a rasp free exhaust set-up with no cats on an LS1 F-body is to run TRUE DUALS using either an X or H-pipe. Totally gets rid of that nasty rasp and sounds flat out intimidating on most cars. Nothing sounds better or meaner IMHO...
Mike
ANY LS1 F-body running a no cat Y-pipe set-up will have some raspy/poppy sounds to it no matter what cat-back system it is going through. It's just that some systems like the SLP dual/dual or Hooker only have a little rasp this way while others such as the Borla, SLP Loudmouth, Flowmaster, or cutouts have a ton of raspiness in their tone. And most of the other cat-back options out there are somewhere in between the exhausts I just mentioned. Putting a Dynomax Bullet Muffler in the I-pipe will help some, but doesn't get rid of it entirely.
The ONLY way to basically have a rasp free exhaust set-up with no cats on an LS1 F-body is to run TRUE DUALS using either an X or H-pipe. Totally gets rid of that nasty rasp and sounds flat out intimidating on most cars. Nothing sounds better or meaner IMHO...
Mike
On The Tree
Joined: Feb 2004
Posts: 112
Likes: 0
Originally Posted by 02RedHawk
I run the SLP D/D, with LT's AND cats and I definitely hear rasp. Its not bad, but its definitely noticable.
TECH Resident
Joined: Sep 2002
Posts: 803
Likes: 0
From: Charlotte, North Carolina
Originally Posted by 16nrollininaws6
You are kidding right? I heard that in person and it was one of the raspiest set-ups I have heard. Even with stock everything @ wide open it was raspy at low-mid RPMS. GMMG, Hooker, and Magnaflow have no rasp, just a clean rumble and a refined sound. Flowmaster doesnt either, but it is a piece of **** cat-back as far as performance goes.
