NPP Vs Z06 mufflers
Thread Starter
Go Canes!
Joined: Dec 2009
Posts: 5,975
Likes: 329
From: Boca Raton FL
St. Jude Donor '11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21
NPP Vs Z06 mufflers
Can anyone tell me the major difference between them and why they like each? 
Here is why I am asking... I have a 2007 A6 convertible that I already installed LG headers, high-flow cats, and x-pipe. the only stock part of my exhaust is my mufflers (non-NPP). Although I love the quiet while cruising with the GF, when I am alone, I want the car to have a better sound. So, my options are....
1. B & B Fusion - very expensive but very nice mufflers. The price is around $1600, plus install. I think these are louder than stock when closed?
2. Z06 (NPP) (used). I can get a set of these for about $500 when I can find them, plus the Mild to Wild, plus install. I know I will need to cut my mufflers pipes and have them welded on these (same as #3 option).
2. Non-Z06 NPP (used). Harder to come by than the Z06 and I am told when open, they are more aggressive than the Z06 ones., but I will still need to weld my pipes on these.
I do not care about the drone when I am alone, but when she is in the car, it may be an issue. Any opinions would help me make my mind up.
Thanks.
Here is why I am asking... I have a 2007 A6 convertible that I already installed LG headers, high-flow cats, and x-pipe. the only stock part of my exhaust is my mufflers (non-NPP). Although I love the quiet while cruising with the GF, when I am alone, I want the car to have a better sound. So, my options are....1. B & B Fusion - very expensive but very nice mufflers. The price is around $1600, plus install. I think these are louder than stock when closed?
2. Z06 (NPP) (used). I can get a set of these for about $500 when I can find them, plus the Mild to Wild, plus install. I know I will need to cut my mufflers pipes and have them welded on these (same as #3 option).
2. Non-Z06 NPP (used). Harder to come by than the Z06 and I am told when open, they are more aggressive than the Z06 ones., but I will still need to weld my pipes on these.
I do not care about the drone when I am alone, but when she is in the car, it may be an issue. Any opinions would help me make my mind up.
Thanks.
Burning Brakes
Joined: Aug 2008
Posts: 819
Likes: 0
From: Tampa (Cigar City) (The Big Sombrero)
I think the difference is the size of the pipes. If I'm not mistaking NPPs are 2.5" and Z06 are 3.0". The Z06 mufflers and xpipe should mount to 1 7/8" headers, and the NPP should mount to the 1 3/4" headers, without further modification that is.
Thread Starter
Go Canes!
Joined: Dec 2009
Posts: 5,975
Likes: 329
From: Boca Raton FL
St. Jude Donor '11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21
Thanks, but I already know about the diffence in the width of the pipe. Doesnt matter anyway due to the fact that BOTH will require I cut my muffler pipes and have them welded on the new one to make them fit over the axle perfectly.
The question is about the mufflers themselves. I am told that the Z06 (when open) are not as aggressive and therefore not as desirable. then I want to compare that with the sound of the Fusions!
...and then there is the other question.... How hard is the necessary vaccum "plumbing" when putting NPP's on a non-NPP car.
The question is about the mufflers themselves. I am told that the Z06 (when open) are not as aggressive and therefore not as desirable. then I want to compare that with the sound of the Fusions!
...and then there is the other question.... How hard is the necessary vaccum "plumbing" when putting NPP's on a non-NPP car.
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
First, just some clarification......Z06 and NPP are totally different creatures. You already know the basic difference, the Z06's are quieter/mellower when open (and cheaper used) than the NPP's which most describe as more raw/raspy when open.
Second, if you get NPP mufflers, you don't need to tear them apart for any welding mod.....that is for the Z06 mufflers only.
Members who have added Z06 mufflers seem to universally like them. Those who have added NPP mufflers seem to universally like them. It's pretty much a personal choice, the kind of sound YOU prefer. I haven't heard the B&B's. Have fun.
Second, if you get NPP mufflers, you don't need to tear them apart for any welding mod.....that is for the Z06 mufflers only.
Members who have added Z06 mufflers seem to universally like them. Those who have added NPP mufflers seem to universally like them. It's pretty much a personal choice, the kind of sound YOU prefer. I haven't heard the B&B's. Have fun.
Thread Starter
Go Canes!
Joined: Dec 2009
Posts: 5,975
Likes: 329
From: Boca Raton FL
St. Jude Donor '11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21
First, just some clarification......Z06 and NPP are totally different creatures. You already know the basic difference, the Z06's are quieter/mellower when open (and cheaper used) than the NPP's which most describe as more raw/raspy when open.
Second, if you get NPP mufflers, you don't need to tear them apart for any welding mod.....that is for the Z06 mufflers only.
Members who have added Z06 mufflers seem to universally like them. Those who have added NPP mufflers seem to universally like them. It's pretty much a personal choice, the kind of sound YOU prefer. I haven't heard the B&B's. Have fun.
Second, if you get NPP mufflers, you don't need to tear them apart for any welding mod.....that is for the Z06 mufflers only.
Members who have added Z06 mufflers seem to universally like them. Those who have added NPP mufflers seem to universally like them. It's pretty much a personal choice, the kind of sound YOU prefer. I haven't heard the B&B's. Have fun.
Safety Car
Joined: Sep 2007
Posts: 4,359
Likes: 6
From: Los Alamitos California
St. Jude Donor '09
First, just some clarification......Z06 and NPP are totally different creatures. You already know the basic difference, the Z06's are quieter/mellower when open (and cheaper used) than the NPP's which most describe as more raw/raspy when open.
Second, if you get NPP mufflers, you don't need to tear them apart for any welding mod.....that is for the Z06 mufflers only.
Members who have added Z06 mufflers seem to universally like them. Those who have added NPP mufflers seem to universally like them. It's pretty much a personal choice, the kind of sound YOU prefer. I haven't heard the B&B's. Have fun.
Second, if you get NPP mufflers, you don't need to tear them apart for any welding mod.....that is for the Z06 mufflers only.
Members who have added Z06 mufflers seem to universally like them. Those who have added NPP mufflers seem to universally like them. It's pretty much a personal choice, the kind of sound YOU prefer. I haven't heard the B&B's. Have fun.
San
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Melting Slicks
Joined: Sep 2008
Posts: 2,360
Likes: 59
From: San Jose California
My 08' NPP tips look to be the same size as my Z06 system, which is also from an 08'. My NPP tips were perforated inside and the Z06 ones are not. (NPP's looked better) With the Z06 mufflers modded they sound like the NPP's. I did the full exhaust in one shot so I can not say for sure if it was the Z06 Manifolds making the difference in sound above 4000 rpm's, but it sounds better now. The ZR1 mufflers are the same as the Z06 mufflers with the mod.
If you can find a set of NPP's I would go for them. (Direct bolt on, just need something to control them)
Replacing the mufflers is not that hard and can be done with a set of jack stands all the way up, it doesn't take long.
DJ
If you can find a set of NPP's I would go for them. (Direct bolt on, just need something to control them)
Replacing the mufflers is not that hard and can be done with a set of jack stands all the way up, it doesn't take long.
DJ
Burning Brakes
Joined: Dec 2007
Posts: 860
Likes: 75
From: Corona CA
I went from NPP to Z06 on my 09 w/ Z51. It was a M6 and the assembly and fit were fine. The Z06 mufflers are much quieter under acceleration, open or closed, however they had a slightly deeper rumble at idle when open. The pipes neck down to 2.5" at the muffler with the Z06. Since you have an automatic, as you mentioned, will require some modification to the over the axle pipes to fit. Almost forgot, these were unmodified Z06 mufflers.
Last edited by vettenevodrvr; Jan 7, 2011 at 12:37 PM.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
I have Z06 mufflers with the MTW controller.
You do not have to cut anything to fit them to your car. If you are getting headers, you order the Z06 versions which mate to them.
All headers are used interchangeably on the Z06 and base models with the only difference being the size of the x-pipes opening to where the catback hooks up. If you already have headers you can just buy this rear pipe to change your headers to a Z06 header. LG sold them to me for the conversion. When I got AR headers I simply ordered the Z06 version. All pipes fit perfect and no cutting/welding was needed.
Im going to bet that the used Z06 plus the cost of the pipes will be cheaper than a used NPP set.
They are dead silent with the butterflies closed. All you hear on the hiway is the wind hitting the windshield.
You do not have to cut anything to fit them to your car. If you are getting headers, you order the Z06 versions which mate to them.
All headers are used interchangeably on the Z06 and base models with the only difference being the size of the x-pipes opening to where the catback hooks up. If you already have headers you can just buy this rear pipe to change your headers to a Z06 header. LG sold them to me for the conversion. When I got AR headers I simply ordered the Z06 version. All pipes fit perfect and no cutting/welding was needed.
Im going to bet that the used Z06 plus the cost of the pipes will be cheaper than a used NPP set.
They are dead silent with the butterflies closed. All you hear on the hiway is the wind hitting the windshield.
Le Mans Master
Joined: Jun 2009
Posts: 6,724
Likes: 652
Actually, they are not.......the factory Z06 mufflers have a non-perforated pipe in the "quiet" section, where the ZR1 mufflers ARE perforated on the quiet side.
ZR1 mufflers, with the valves closed, are quieter than factory Z06 mufflers
ZR1 mufflers, with the valves closed, are quieter than factory Z06 mufflers
Safety Car
Joined: Sep 2006
Posts: 4,075
Likes: 6
From: Wilmington NC
There is no modification needed when adding the NPP exhaust, I added an 08 NPP to my 07 A6, direct replacement to the stock exhaust I removed.Not true, the NPP exhaust has the same diameter tips (3 1/2") as the ZO6 Exhaust. The stock 07 exhaust tips were 2 1/2 " in diameter.
Last edited by j_digi454; Jan 4, 2011 at 04:17 PM.
Thread Starter
Go Canes!
Joined: Dec 2009
Posts: 5,975
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From: Boca Raton FL
St. Jude Donor '11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21
Intermediate
Joined: Jun 2009
Posts: 34
Likes: 0
From: Hampton Bays NY
Thread Starter
Go Canes!
Joined: Dec 2009
Posts: 5,975
Likes: 329
From: Boca Raton FL
St. Jude Donor '11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21
