Damn rasp gossip....
Damn rasp gossip.... Here's my deal, i love loud, the louder the muscle car the happier i am. So when i bought my LS1 i got the SLP loudmouth catback b/c i fiugred it was the loudest i can get w/out payin through the nose. Now my next plan was to save up 1200 bux and buy QTP headers and y-pipe w/ high flow carsound cats. All i've been hearing is that you get a horrible rasp w/ this setup ...i deffinatly need cats for emmission purposes here in CT. So if i dont spend the money on the LT's and ypipe, how much horse am i sacrificing by keeping the stock manifold and y-pipe??? Are there simple bolt ons i can do to make up the power loss, i love the sound i get w/ the stock manifold/y-pipe but it just seems incomplete w/out them. What do you guys think?? Is there maybe a better cat back to make it sound less raspy w/ headers/catted ypipe?? Thanks
Launching!
Joined: Mar 2004
Posts: 245
Likes: 0
Wow your posting all over lol! You are in luck. I am in a similiar boat. Long tubes and off road y pipe is worth between 15-30 RWHP. Usually right around 25though. There is always other mods you can do for more speed. Eventually though it will hold you back when you engine needs to "exhale" better - like heads, or an agressive cam.
Anyways I have a loudmouth also and have heard all the talk of rasp and being too loud. Well I am undertaking the project this Friday. I am going with Flowtech Long Tube Headers, no cats y pipe and Loudmouth. I am going to find out first hand what its like. I'm not even sure what rasp sounds like at this point. I do know my friend has a Vette with headers, no cats, and no mufflers and yeah its pretty loud, but tolerable in my book. I like it loud. I just don't like the DRONING sound at highway speeds. I usually fix that by driving faster or slower though. <66 or >75. Changing gears will move that to a different range though.
Anyways I will let you - and everyone else know how it sounds when all is complete.
Anyways I have a loudmouth also and have heard all the talk of rasp and being too loud. Well I am undertaking the project this Friday. I am going with Flowtech Long Tube Headers, no cats y pipe and Loudmouth. I am going to find out first hand what its like. I'm not even sure what rasp sounds like at this point. I do know my friend has a Vette with headers, no cats, and no mufflers and yeah its pretty loud, but tolerable in my book. I like it loud. I just don't like the DRONING sound at highway speeds. I usually fix that by driving faster or slower though. <66 or >75. Changing gears will move that to a different range though.
Anyways I will let you - and everyone else know how it sounds when all is complete.
Originally Posted by elderon
Wow your posting all over lol! You are in luck. I am in a similiar boat. Long tubes and off road y pipe is worth between 15-30 RWHP. Usually right around 25though. There is always other mods you can do for more speed. Eventually though it will hold you back when you engine needs to "exhale" better - like heads, or an agressive cam.
Anyways I have a loudmouth also and have heard all the talk of rasp and being too loud. Well I am undertaking the project this Friday. I am going with Flowtech Long Tube Headers, no cats y pipe and Loudmouth. I am going to find out first hand what its like. I'm not even sure what rasp sounds like at this point. I do know my friend has a Vette with headers, no cats, and no mufflers and yeah its pretty loud, but tolerable in my book. I like it loud. I just don't like the DRONING sound at highway speeds. I usually fix that by driving faster or slower though. <66 or >75. Changing gears will move that to a different range though.
Anyways I will let you - and everyone else know how it sounds when all is complete.
Anyways I have a loudmouth also and have heard all the talk of rasp and being too loud. Well I am undertaking the project this Friday. I am going with Flowtech Long Tube Headers, no cats y pipe and Loudmouth. I am going to find out first hand what its like. I'm not even sure what rasp sounds like at this point. I do know my friend has a Vette with headers, no cats, and no mufflers and yeah its pretty loud, but tolerable in my book. I like it loud. I just don't like the DRONING sound at highway speeds. I usually fix that by driving faster or slower though. <66 or >75. Changing gears will move that to a different range though.
Anyways I will let you - and everyone else know how it sounds when all is complete.
Launching!
Joined: Mar 2004
Posts: 245
Likes: 0
Originally Posted by 99CamaroSS
Yea, tis the season...my life revolves around my car and my job consists of sitting in front of a computer all day so i have time to sit and think about m y car and post tons of threads to get my thoughts out. Well, i'm not lookin to do an off road, i have to have cats for emissions...qtp makes the carsound cats w/ theirs so i was lookin into that, and like urself, i dont care how loud it is, just as long as it isnt this loud "rasp" that sounds horrible that everyone is ssaying. Thanks for the response.
If you go with QTPs Catted Y pipe you won't have any rasp even with the loudmouth. My Corsa LTs ORY was very raspy also but after adding the cats it disappeared. That setup will be loud even with the cats but it will be rasp free.
Originally Posted by Ryan02SS
If you go with QTPs Catted Y pipe you won't have any rasp even with the loudmouth. My Corsa LTs ORY was very raspy also but after adding the cats it disappeared. That setup will be loud even with the cats but it will be rasp free.
Rasp is caused by using an ORY pipe on the LS1. When you add cats back to the setup your rasp will be gone. Do you have any rasp with your stock manifolds and cats? I'm guessing not. Adding cats to LTs @ Loudmouth will eliminate the rasp but it will still be very loud due to the added flow volume from the headers. From my personal experience adding cats to my LTs ORY Corsa setup the rasp was gone and it really cleaned the sound up also. Before the cats it was a raw frantic type exhaust note. After the cats it became a deep rumble that sounds alot better IMO.
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Originally Posted by Ryan02SS
Rasp is caused by using an ORY pipe on the LS1. When you add cats back to the setup your rasp will be gone. Do you have any rasp with your stock manifolds and cats? I'm guessing not. Adding cats to LTs @ Loudmouth will eliminate the rasp but it will still be very loud due to the added flow volume from the headers. From my personal experience adding cats to my LTs ORY Corsa setup the rasp was gone and it really cleaned the sound up also. Before the cats it was a raw frantic type exhaust note. After the cats it became a deep rumble that sounds alot better IMO.
Yea i really dont have any rasp right now w/ the stock manifolds/ypipe. Well that sounds good from what your saying, i guess i do have to save up the $$$ after all, any other opinions are still welcome though. Thanks for the info all.
Launching!
Joined: Mar 2004
Posts: 245
Likes: 0
If I end up not like the sound of mine, I will simply have the exhaust modified. Put in a real muffler instead of the resonator like the other guys do. I listened to a website that had long tubes and headers with no cats and it didn't sound that much different than what i have now - of course it IS hard to get an accurate measurement of exhaust by a sound clip over computer speakers.....
On The Tree
Joined: Nov 2001
Posts: 161
Likes: 0
From: Delaware, OH
Go true duals, and forget your rasp problems. Best mod I did on my car after I did my cam swap. I almost hate the raspy sound of a uncatted + catback F-Body now. To me, it actually sounds like ***.
But putting cats back on should help with the noise though...
But putting cats back on should help with the noise though...
TECH Enthusiast
Joined: Oct 2003
Posts: 729
Likes: 0
From: Bakersfield, Ca.
I agree with the LT + Cats + LM = no rasp.
When I just had the LM on by itself, I had more rasp with just the stock exhaust.
I think it sounds great, but it does get loud and it drones a little. I am used to it now, because it drowns out the Bumble Bee sounds of the Rice cars in my area.
When I just had the LM on by itself, I had more rasp with just the stock exhaust.
I think it sounds great, but it does get loud and it drones a little. I am used to it now, because it drowns out the Bumble Bee sounds of the Rice cars in my area.
Originally Posted by 99CamaroSS
Here's my deal, i love loud, the louder the muscle car the happier i am. So when i bought my LS1 i got the SLP loudmouth catback b/c i fiugred it was the loudest i can get w/out payin through the nose. Now my next plan was to save up 1200 bux and buy QTP headers and y-pipe w/ high flow carsound cats. All i've been hearing is that you get a horrible rasp w/ this setup ...i deffinatly need cats for emmission purposes here in CT. So if i dont spend the money on the LT's and ypipe, how much horse am i sacrificing by keeping the stock manifold and y-pipe??? Are there simple bolt ons i can do to make up the power loss, i love the sound i get w/ the stock manifold/y-pipe but it just seems incomplete w/out them. What do you guys think?? Is there maybe a better cat back to make it sound less raspy w/ headers/catted ypipe?? Thanks
