Dyno----c6 stock mufflers
Thread Starter
Instructor
Joined: Jun 2010
Posts: 160
Likes: 0
From: Spring Lake Michigan
Dyno----c6 stock mufflers
I have a 2007 Vette--A6-2:56 gears--CNC heads, cam, headers, etc----I'm still running the stock mufflers----would NPP or B&B PRT's give me more RWHP ?? Anybody done a dyno test on this subject ?? Anybody have a pair of 2008 NPP mufflers for sale ?? I DON'T want highway drone !! THANKS !!!
Drifting
Joined: Jun 2006
Posts: 1,730
Likes: 4
From: Delray Beach Florida
you could do electric cutouts to get the power you want when you need it (more then the NPPs). Then you can keep your stock mufflers and keep the car as a sleeper, no one will see you coming till you want them to
Tech Contributor
Joined: Jul 2002
Posts: 14,949
Likes: 263
From: St. Louis, MO
St. Jude Donor '08
I have cutouts and stock mufflers.
When I was bolt on only 386 rwhp, there was no difference cutouts open or closed.
Now that I'm 450 rwhp its about 6 rwhp across the board more power with them open.
Here's an open and closed dyno sheet.
When I was bolt on only 386 rwhp, there was no difference cutouts open or closed.
Now that I'm 450 rwhp its about 6 rwhp across the board more power with them open.
Here's an open and closed dyno sheet.
Thread Starter
Instructor
Joined: Jun 2010
Posts: 160
Likes: 0
From: Spring Lake Michigan
WOW !!! Is this a kit you buy, how do control the cut-outs ??? THANKS for the pictures !!!
Drifting
Joined: Jun 2006
Posts: 1,730
Likes: 4
From: Delray Beach Florida
Maryland speed (a vendor here) has QTP low profile cutouts you can buy, I think its all the pieces you'd need to have it welded in place
Tech Contributor
Joined: Jul 2002
Posts: 14,949
Likes: 263
From: St. Louis, MO
St. Jude Donor '08
http://forums.corvetteforum.com/c6-t...-on-my-c6.html
Here's the first post.
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.
I did not see any track gain with them so far - but we had an unusually cold day at the track Saturday (negative 230 DA and 53 degrees and 70% humidity) and I could not get any grip at the line, spinning every time.
I did notice on my HP Tuners logs at the strip I was running lean so I added some fuel, but I can't say if that was because the cutouts or the cold weather but I will find out soon. We don't stay cool long.
Overall 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.
I did not see any track gain with them so far - but we had an unusually cold day at the track Saturday (negative 230 DA and 53 degrees and 70% humidity) and I could not get any grip at the line, spinning every time.
I did notice on my HP Tuners logs at the strip I was running lean so I added some fuel, but I can't say if that was because the cutouts or the cold weather but I will find out soon. We don't stay cool long.
Overall 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:
