Slp loudmouth
Thread Starter
Instructor
Joined: Mar 2013
Posts: 160
Likes: 3
From: Missouri
Slp loudmouth
Just installed an slp loudmouth exhaust on m C5 and I love it! However, at idle it sounds sorta motorboat/tractorish, otherwise it sounds great driving around. Is there any fix to this without making the car quieter?
Drifting
Joined: Mar 2011
Posts: 1,807
Likes: 331
From: Ocala FL
I have the SLP Loudmouths with the stock cats and H-pipe and really like the gurgling and popping sounds when decelerating. That's what's been holding me back from swapping out my H-pipe to the Borla X-pipe. I don't want to lose that sound... I wonder if I'd see any gains since I've also got a set of Breathless Racing LT Headers running into the factory cats or not. IF I do go X-pipe it will likely be the Borla one.
Le Mans Master
Joined: May 2005
Posts: 6,366
Likes: 249
From: Fort Lauderdale, Florida
Part of the reason C5's don't rumble like other cars is because LS motors have a unique firing order. Instead of going to an x-pipe a true H-pipe would give more of a rumble. The x-pipe will smooth out the exhaust sound. The factory H-pipe is a joke. While it looks as fat as the exhaust pipes, the holes that are cut out where the H fits in are very small and not much exhaust gets through there. I think the holes are something like only a 1/2". It needs to be disassembled and the holes enlarged to the crossover pipe's inside diameter.
Drifting
Joined: Mar 2011
Posts: 1,807
Likes: 331
From: Ocala FL
Part of the reason C5's don't rumble like other cars is because LS motors have a unique firing order. Instead of going to an x-pipe a true H-pipe would give more of a rumble. The x-pipe will smooth out the exhaust sound. The factory H-pipe is a joke. While it looks as fat as the exhaust pipes, the holes that are cut out where the H fits in are very small and not much exhaust gets through there. I think the holes are something like only a 1/2". It needs to be disassembled and the holes enlarged to the crossover pipe's inside diameter.
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Melting Slicks
Joined: Jun 2013
Posts: 3,473
Likes: 691
From: West Virginia
The H pipe is only there for pressure equalization - you don't need big holes for that. SLP's basically being open pipes just pass through the engine noise without the sound deadening that even a small muffler provides. Personally, if I wanted that, I would just put a couple straight pipes on there and call it done. Or maybe a couple megaphones like they use on some bikes - now that would be loud.
Last edited by jackthelad; Mar 28, 2015 at 02:34 PM.
Navigator
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From: buffalo mo
Thread Starter
Instructor
Joined: Mar 2013
Posts: 160
Likes: 3
From: Missouri
Might sound crazy, but I love the drone and crazy loudness. I daily drive it all day, put over 3000 miles on it in a few months. The sound has been growing on me actually. However, does anyone know how to keep the pipes aligned? The last one to the left seems to be sagging a little...
Drifting
Joined: Mar 2011
Posts: 1,807
Likes: 331
From: Ocala FL
Might sound crazy, but I love the drone and crazy loudness. I daily drive it all day, put over 3000 miles on it in a few months. The sound has been growing on me actually. However, does anyone know how to keep the pipes aligned? The last one to the left seems to be sagging a little...
Thread Starter
Instructor
Joined: Mar 2013
Posts: 160
Likes: 3
From: Missouri
That's no fun, I love the look and sound of them but I'm very OCD about my car so it always irks me to have pipes uneven
Pro
Joined: Apr 2010
Posts: 651
Likes: 17
From: MD
Might sound crazy, but I love the drone and crazy loudness. I daily drive it all day, put over 3000 miles on it in a few months. The sound has been growing on me actually. However, does anyone know how to keep the pipes aligned? The last one to the left seems to be sagging a little...
Le Mans Master
Joined: Nov 2006
Posts: 7,021
Likes: 46
From: enterprise al
St. Jude Donor '08
it will sound 100x's better with an X-pipe.. get a true X though, like magniflow (what I have to compliment the Long tubes and Borla Straights)
I had some alignment issues too.. ended up going to lowes, tossing some hardware in the cart, and building some stronger brackets for the rear mounts.. looks much better now
I had some alignment issues too.. ended up going to lowes, tossing some hardware in the cart, and building some stronger brackets for the rear mounts.. looks much better now
Le Mans Master
Joined: Feb 2012
Posts: 6,644
Likes: 479
From: OK
Part of the reason C5's don't rumble like other cars is because LS motors have a unique firing order. Instead of going to an x-pipe a true H-pipe would give more of a rumble. The x-pipe will smooth out the exhaust sound. The factory H-pipe is a joke. While it looks as fat as the exhaust pipes, the holes that are cut out where the H fits in are very small and not much exhaust gets through there. I think the holes are something like only a 1/2". It needs to be disassembled and the holes enlarged to the crossover pipe's inside diameter.