2007 NPP Fit
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Joined: Jun 2011
Posts: 50
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From: Grand Rapids Michigan
2007 NPP Fit
Well it must be nearing spring, because here is another exhaust question! My 2007 LS2 6 speed manual is too quiet. I'd like to replace stock exhaust with GM NPP (bi-modal). Does anybody know for sure if NPP will fit...and if so does it matter what year/model the NPP exhaust came from?
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Yes, they fit.
If you are going to replace just the mufflers, which include the over axle pipes, you need to find a 2008 NPP set.
If you can only find a 2009 or newer set, then you will also need to replace the X-pipe OR have a muffler shop adapt your current X-pipe to the passenger side muffler pipe. In 2009 GM changed the angle on the passenger side pipe so the 2008 and older don't match up exactly. The difference is small but enough that it isn't a straight swap between years. OR just find what you can and cut and weld them to your pipes.
You could also use Z06 mufflers. They would have to be cut off their over axle pipes, your mufflers would have to be cut off your over axle pipes and the Z06 mufflers would then be welded to your pipes. The Z06 mufflers are generally cheaper on the used market but they are also not as loud as the NPP mufflers, unless you found some 2011 or newer Z06's.
If you are going to replace just the mufflers, which include the over axle pipes, you need to find a 2008 NPP set.
If you can only find a 2009 or newer set, then you will also need to replace the X-pipe OR have a muffler shop adapt your current X-pipe to the passenger side muffler pipe. In 2009 GM changed the angle on the passenger side pipe so the 2008 and older don't match up exactly. The difference is small but enough that it isn't a straight swap between years. OR just find what you can and cut and weld them to your pipes.
You could also use Z06 mufflers. They would have to be cut off their over axle pipes, your mufflers would have to be cut off your over axle pipes and the Z06 mufflers would then be welded to your pipes. The Z06 mufflers are generally cheaper on the used market but they are also not as loud as the NPP mufflers, unless you found some 2011 or newer Z06's.
Safety Car
Joined: Feb 2007
Posts: 4,684
Likes: 107
From: Opelika Alabama
Well it must be nearing spring, because here is another exhaust question! My 2007 LS2 6 speed manual is too quiet. I'd like to replace stock exhaust with GM NPP (bi-modal). Does anybody know for sure if NPP will fit...and if so does it matter what year/model the NPP exhaust came from?
Safety Car
Joined: Feb 2007
Posts: 4,684
Likes: 107
From: Opelika Alabama
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
If you buy ZO6 manifolds, cats, mid pipe then you'll have to use ZO6 mufflers unless you want to cut and weld.
NPP and ZO6 bimode sre different diameters and do not interchange.
2008 NPP will bolt on to your existing mid pipe. 2009 and up will not.
NPP and ZO6 bimode sre different diameters and do not interchange.
2008 NPP will bolt on to your existing mid pipe. 2009 and up will not.
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Drifting
Joined: Aug 2005
Posts: 1,645
Likes: 90
From: Sparks NV
I figured if I'm going to the trouble of doing it I might as well pick up a few horses. I did the complete Z06 3" Bi-mode system, manifolds and all. Did my own control system. Why bother with the 2.5" NPP just to make it sound different. Sounds and works great! The seat of the pants dyno tells me it's faster too. I get quiet when I want and loud when I want.
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