Adding NPP Option
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,150
From: SW Florida
2021 C6 of the Year Finalist - Modified
Drifting
Joined: Mar 2010
Posts: 1,901
Likes: 361
From: TX
If you get a set of NPP mufflers that doesn't quite fit due to changes in the crossover or whatever, it seems to me like it would be real easy (and cheap) to go to a muffler shop and simply have them cut off the old mufflers and weld the new ones onto the existing pipes. This isn't rocket science.
I've seen NPP mufflers go for as little as $300. Seems to me like this would be a much more economical solution.
I've seen NPP mufflers go for as little as $300. Seems to me like this would be a much more economical solution.
Racer
Joined: Apr 2014
Posts: 489
Likes: 63
From: Mason OH
I'm looking to buy a 2013 C6 Grand Sport. One of my "must haves" while looking for the car is the NPP Exhaust Option. The car I'm looking at has all of my other "must haves" but this one.
I was wondering if the hardware for NPP is available in kit form and be installed on an existing car.
If so, is it a bolt on? How much wiring or vacuum line installation is required?
Thanks for any help in advance.
I was wondering if the hardware for NPP is available in kit form and be installed on an existing car.
If so, is it a bolt on? How much wiring or vacuum line installation is required?
Thanks for any help in advance.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,104
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
With the unaltered OEM NPP option you can't. With any of the controllers for your NPP option car, and you could make your own for <$10, you can open or close valves yourself and they'll stay that way until you make the choice to change it. There is no 3000 RPM override.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,104
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
If you get a set of NPP mufflers that doesn't quite fit due to changes in the crossover or whatever, it seems to me like it would be real easy (and cheap) to go to a muffler shop and simply have them cut off the old mufflers and weld the new ones onto the existing pipes. This isn't rocket science.
I've seen NPP mufflers go for as little as $300. Seems to me like this would be a much more economical solution.
I've seen NPP mufflers go for as little as $300. Seems to me like this would be a much more economical solution.
) I took it to a muffler shop and they cut off my base mufflers and welded in the Z06 ones and re-installed for $100. The first NPP in a box was the early design that incorporated a vacuum pump. I installed it in about 20 minutes. Sometime later it failed and the company sent me their newer style replacement (no charge), which took over an hour to install, mostly because of the route I took for the tubing.
Current list price for just the mufflers (includes the axle pipe) is $2240 plus tax. About $1500 from an online dealer plus shipping. NPP in a box not included. So yeah, I could see someone charging $2K installed, but only if it was brand new stuff.
Former Vendor
Joined: Nov 2005
Posts: 11,792
Likes: 255
From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
Thank you. I appreciate that.....
Awesome ... as I did not mean to offend you in any way !
So I guess the "miss" here is that that I assumed ...
and the person that made the statement did not state that you were supplying everything
We also don't want to mislead those that might have the skills to do it in the garage with some beer and a friend like I did ....
Dave
So I guess the "miss" here is that that I assumed ...
and the person that made the statement did not state that you were supplying everything We also don't want to mislead those that might have the skills to do it in the garage with some beer and a friend like I did ....
Dave
when people start with comments like..... "He's a rip off! I could done that myself for FREE....."
That has no bearing on what a registered insured shop charges....
Fact is, you can pay top dollar for parts or you can get them for free....
And just because someone has a lift in their garage at home and does their own work, does not mean I'm a rip off or whatever....
Everyone here (including myself
) has made comments on this forum that, while not intended to be derogatory....Could have accidentally stepped on someone else's toes here or there by what you post.
Again, as a paid vendor, shop owner, liability insurance policy holder, bla bla bla.... I don't like seeing
posts that imply that my pricing is out of line...
I appreciate your feedback.
Chuck CoW
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Thread Starter
Instructor
Joined: Jun 2017
Posts: 133
Likes: 4
From: SF Bay Area CA
NPP in a box is right at about $200 but the NPP mufflers go from $400 to maybe $600 but just makes sure you get the right size for your car. If you have a Z06 make sure you get the Z06 mufflers. If you have a base/GS make sure you get the base/GS mufflers. Make sure you get the right years also. Base 05-08 same routing mid-pipe, Base/GS 09-13 same routing mid-pipe both those years is 2.5" at the connection from mid-pipe to muffler. The Z06/ZR1 is 3" at the connections from mid-pipe to muffler.
So I just can't add the valves onto my existing non-NPP mufflers? I need to get an additional set of mufflers that are made for the NPP option?
If I find a set used, shouldn't the valves already be attached to the mufflers> Or, am I not understanding the configuration?
Burning Brakes
Joined: Apr 2016
Posts: 1,120
Likes: 110
From: Chattanooga TN
Oh. Okay.
So I just can't add the valves onto my existing non-NPP mufflers? I need to get an additional set of mufflers that are made for the NPP option?
If I find a set used, shouldn't the valves already be attached to the mufflers> Or, am I not understanding the configuration?
So I just can't add the valves onto my existing non-NPP mufflers? I need to get an additional set of mufflers that are made for the NPP option?
If I find a set used, shouldn't the valves already be attached to the mufflers> Or, am I not understanding the configuration?
An yes the valve will be inside the tailpipe and you will see the actuator above the tail pipe. One valve and actuator per tailpipe. If you have any questions you can PM and I'll try to point you in the right direction.
Le Mans Master
Joined: Oct 2014
Posts: 8,666
Likes: 2,722
From: Atlanta GA
Oh. Okay.
So I just can't add the valves onto my existing non-NPP mufflers? I need to get an additional set of mufflers that are made for the NPP option?
If I find a set used, shouldn't the valves already be attached to the mufflers> Or, am I not understanding the configuration?
So I just can't add the valves onto my existing non-NPP mufflers? I need to get an additional set of mufflers that are made for the NPP option?
If I find a set used, shouldn't the valves already be attached to the mufflers> Or, am I not understanding the configuration?
There were two different angles on the 2 1/2 NPPS and then you have the 3 inch BI Mode ZO6 type
Save yourself a lot of trouble and try and purchase a set that fits your car using the parameters above. you can make any set fit but save yourself a lot of trouble and buy the correct mufflers and they will bolt right up
Dave
Last edited by Dcasole; Oct 11, 2017 at 08:08 PM.
Former Vendor
Joined: Nov 2005
Posts: 11,792
Likes: 255
From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
Burning Brakes
Joined: Apr 2016
Posts: 1,120
Likes: 110
From: Chattanooga TN
Chuck because it would be cheaper than buying an aftermarket axleback and have some sound to it. But Chuck is correct the valves would stay open all the time. But if you wanted it to get quite then you would need to install the NPP in a box. 
Former Vendor
Joined: Nov 2005
Posts: 11,792
Likes: 255
From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
Good answer....
Chuck CoW