quieter mufflers please......
Thread Starter
Racer
Joined: Sep 2008
Posts: 448
Likes: 0
From: West Monroe La. (Fastest Bolt On M6)
quieter mufflers please......
hey guys.. I have weld in magnaflow bullets on my car 12 in. long..they weren't that bad till i added the z06 manifolds cat and H pipe..now i can hardly hear myself think from all the drone inside..Is there another muffler out there that wouldnt be so bad..any info..Thanks..
Thread Starter
Racer
Joined: Sep 2008
Posts: 448
Likes: 0
From: West Monroe La. (Fastest Bolt On M6)
Thread Starter
Racer
Joined: Sep 2008
Posts: 448
Likes: 0
From: West Monroe La. (Fastest Bolt On M6)
Pro
Joined: Sep 2004
Posts: 624
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From: Bakersfield Ca.
The 2008 NPP mufflers are not the same as the Z06 Mufflers. The Z06 mufflers are too quiet in the open position but the the 08 NPP's are just about right; that is why I modified my Z06 mufflers to be louder in the open position and very quiet when closed
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From: Lakewood Ranch, FL
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Drifting
Joined: Jul 2003
Posts: 1,320
Likes: 45
From: Atlanta, GA.
FWIW, I have the 08 Z06 NPP on my C6 I bought off a member here. For me, it's just right and probably a little louder than the others in OPEN mode since I've got LT headers. When the baffles are shut its very quite.
Blown34, what did you do when you "modified your Z06 mufflers" to make the louder?
Blown34, what did you do when you "modified your Z06 mufflers" to make the louder?
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
I like my NPP's a lot more than a friends Z06 mufflers. The Z06 mufflers are way too quiet in the open position.
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
I love my stock mufflers with QTP cutouts
Here's a copy and paste from my thread with more info there, including dyno sheets. The cutouts are worth about 6 rwhp/tq across the board once I added the cam. They have been a great mod for the nearly 2 years I've had them. One of my favorite mods as a matter of fact as I like being able to be whisper quiet or outrageously loud. And at $400 they are cheaper than the NPP's.
http://forums.corvetteforum.com/c6-t...-on-my-c6.html
http://forums.corvetteforum.com/c6-t...-on-my-c6.html
Had QTP cutouts installed by Florida Performance in Fort Lauderdale. Overall very pleased with the job Rob, the shop owner, did. This was his first C6 and he found a great place to put them and made the custom mandrel bent Y-pipes to maximize flow from the cutouts. We found no way to put them right after the collectors but they fit well by the trans. I have the DTE brace too but it wasn't in the way.
Installed the wiring myself along the drivers side rocker panel, behind seat then out the wheel well under the carpet. Removed the rear inner fender and drilled a small hole in the wheel well then ran the wire down to the cutouts. Hardest part is finding a hot wire when the ignition is on on these C6's. I ended up tapping the seat heater fuse as others here have done.
They are loud and DEEP when open at idle. I've actually heard louder exhaust though, I was kind of surprised they are not louder. I think it is because of the turn downs and the fact that I have cats and the pipes are pretty long before the cutouts. On the track they have a nice race car sound - I'd say like Borla Stingers plus 25%. When you open them at a stoplight you will turn heads, that's for sure.
Overall extremely happy with the mod, it gives me quiet during my morning drive but loud when I'm at the track which is what I wanted.
Here is a video of idle with cutouts open and closed. The gain on the mike makes the closed sound much louder than it is, it's really quiet with factory mufflers even with my cam.
Here are some pics:
Installed the wiring myself along the drivers side rocker panel, behind seat then out the wheel well under the carpet. Removed the rear inner fender and drilled a small hole in the wheel well then ran the wire down to the cutouts. Hardest part is finding a hot wire when the ignition is on on these C6's. I ended up tapping the seat heater fuse as others here have done.
They are loud and DEEP when open at idle. I've actually heard louder exhaust though, I was kind of surprised they are not louder. I think it is because of the turn downs and the fact that I have cats and the pipes are pretty long before the cutouts. On the track they have a nice race car sound - I'd say like Borla Stingers plus 25%. When you open them at a stoplight you will turn heads, that's for sure.
Overall extremely happy with the mod, it gives me quiet during my morning drive but loud when I'm at the track which is what I wanted.
Here is a video of idle with cutouts open and closed. The gain on the mike makes the closed sound much louder than it is, it's really quiet with factory mufflers even with my cam.
Here are some pics:
Race Director
Joined: Apr 2008
Posts: 17,373
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From: Chatsworth California
Pro
Joined: Sep 2004
Posts: 624
Likes: 0
From: Bakersfield Ca.
Both 2008 NPP's and Z06 mufflers have 2.5" inlets, it's just that the Z06 3" pipe tapers doen to 2.5" at the mufflers
Pro
Joined: Sep 2004
Posts: 624
Likes: 0
From: Bakersfield Ca.
FWIW, I have the 08 Z06 NPP on my C6 I bought off a member here. For me, it's just right and probably a little louder than the others in OPEN mode since I've got LT headers. When the baffles are shut its very quite.
Blown34, what did you do when you "modified your Z06 mufflers" to make the louder?
Blown34, what did you do when you "modified your Z06 mufflers" to make the louder?
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
It's easy to change girlfriends, but also pretty easy to change the exhaust tone with the NPP's and the M2W controller (if the girlfriend is a keeper). Good project that won't cost a lot of $ and is an easy back yard mod. Open, it not overbearing at cruise, but screams big time at WOT. Closed, it's as quiet as stock. I've had mine for several months now and still get quite a kick out of it. Highly recommend it.
Melting Slicks
Joined: Sep 2003
Posts: 3,172
Likes: 4
From: Central Coast CA
Here's a copy and paste from my thread with more info there, including dyno sheets. The cutouts are worth about 6 rwhp/tq across the board once I added the cam. They have been a great mod for the nearly 2 years I've had them. One of my favorite mods as a matter of fact as I like being able to be whisper quiet or outrageously loud. And at $400 they are cheaper than the NPP's.
http://forums.corvetteforum.com/c6-t...-on-my-c6.html
http://forums.corvetteforum.com/c6-t...-on-my-c6.html
Thread Starter
Racer
Joined: Sep 2008
Posts: 448
Likes: 0
From: West Monroe La. (Fastest Bolt On M6)
Here's a copy and paste from my thread with more info there, including dyno sheets. The cutouts are worth about 6 rwhp/tq across the board once I added the cam. They have been a great mod for the nearly 2 years I've had them. One of my favorite mods as a matter of fact as I like being able to be whisper quiet or outrageously loud. And at $400 they are cheaper than the NPP's.
http://forums.corvetteforum.com/c6-t...-on-my-c6.html
http://forums.corvetteforum.com/c6-t...-on-my-c6.html
Burning Brakes
Joined: May 2006
Posts: 1,110
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From: stuart fl
dicky
Thread Starter
Racer
Joined: Sep 2008
Posts: 448
Likes: 0
From: West Monroe La. (Fastest Bolt On M6)
