opinions we got 
New exhaust
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 752
Likes: 0
From: Lebanon CT.
New exhaust
I have had NPP exhaust system on my 06 C6 for several years. I am thinking of something different. Been looking at Borla axle back. Anyone have an opinion on them or something like?
So that’s means I also have a set of NPP that are in great shape if anyone is interested.
Thanks Rod
So that’s means I also have a set of NPP that are in great shape if anyone is interested.
Thanks Rod
Burning Brakes
Joined: Aug 2011
Posts: 1,141
Likes: 49
From: Northridge CA
In my humble opinion, anything louder than the Corsa Sport is too loud. Had the Billy Boat PRT, and it was way too loud. My wife wore ear plugs!!!
Extremely happy with the CS. I can hear it, but it isn't overbearing like my ex.
Extremely happy with the CS. I can hear it, but it isn't overbearing like my ex.
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 752
Likes: 0
From: Lebanon CT.
I also have a set of headers I just bought a new pickup and it has a set of Borla on it and it sounds terrific. You are correct it does sound good just wanted some that was a little deeper growl.
Le Mans Master
Joined: Sep 2014
Posts: 7,001
Likes: 988
From: lake havasu city arizona
They drone but it sounds good to me and then if the wife wants quiet, click and "Viola" quiet she has
NSF
Last edited by Not So Fast; Feb 3, 2018 at 09:08 PM.
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 752
Likes: 0
From: Lebanon CT.
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Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,149
From: SW Florida
2021 C6 of the Year Finalist - Modified
I had the NPP muffler option on my GS, but now have Borla 'Touring' mufflers instead ....
___________________________
I have always liked the NPP mufflers that came on my GS ... until I installed a set of headers on the car.
During normal driving the car was really no louder with the headers and the NPP as it was with the stock exhaust manifolds and the NPP.
The big problem was at wide open throttle (WOT) ... When the NPP valves would open fully at WOT, the car was just obnoxiously loud when I installed headers.
The only fix was to remove the NPP mufflers and install a set of Borla 'Touring' mufflers.
Now the car don't attract so much attention when at WOT ... It sill has a nice sound, but not that "In Your Face" noise anymore when you put your foot in it.
I'm happy
___________________________
I have always liked the NPP mufflers that came on my GS ... until I installed a set of headers on the car.
During normal driving the car was really no louder with the headers and the NPP as it was with the stock exhaust manifolds and the NPP.
The big problem was at wide open throttle (WOT) ... When the NPP valves would open fully at WOT, the car was just obnoxiously loud when I installed headers.
The only fix was to remove the NPP mufflers and install a set of Borla 'Touring' mufflers.
Now the car don't attract so much attention when at WOT ... It sill has a nice sound, but not that "In Your Face" noise anymore when you put your foot in it.
I'm happy
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 752
Likes: 0
From: Lebanon CT.
I had the NPP muffler option on my GS, but now have Borla 'Touring' mufflers instead ....
___________________________
I have always liked the NPP mufflers that came on my GS ... until I installed a set of headers on the car.
During normal driving the car was really no louder with the headers and the NPP as it was with the stock exhaust manifolds and the NPP.
The big problem was at wide open throttle (WOT) ... When the NPP valves would open fully at WOT, the car was just obnoxiously loud when I installed headers.
The only fix was to remove the NPP mufflers and install a set of Borla 'Touring' mufflers.
Now the car don't attract so much attention when at WOT ... It sill has a nice sound, but not that "In Your Face" noise anymore when you put your foot in it.
I'm happy
___________________________
I have always liked the NPP mufflers that came on my GS ... until I installed a set of headers on the car.
During normal driving the car was really no louder with the headers and the NPP as it was with the stock exhaust manifolds and the NPP.
The big problem was at wide open throttle (WOT) ... When the NPP valves would open fully at WOT, the car was just obnoxiously loud when I installed headers.
The only fix was to remove the NPP mufflers and install a set of Borla 'Touring' mufflers.
Now the car don't attract so much attention when at WOT ... It sill has a nice sound, but not that "In Your Face" noise anymore when you put your foot in it.
I'm happy
Burning Brakes
Joined: Jan 2018
Posts: 973
Likes: 268
From: Oro Valley Arizona
Without NPP
Mine never had the NPP exhaust I have driven a few with and a few without. I drove one with the Borla. I really didn’t like any of them.
For some reason mine was recalled and they replaced the Cats / Pipes / Mufflers and Tips. I do not know what exhaust it has been installed but it sounds great. I wish I knew what type it has. Just love it Nice and quite with normal driving and nice and loud when pushing it.
For some reason mine was recalled and they replaced the Cats / Pipes / Mufflers and Tips. I do not know what exhaust it has been installed but it sounds great. I wish I knew what type it has. Just love it Nice and quite with normal driving and nice and loud when pushing it.
Last edited by jeffs64; Feb 16, 2018 at 01:47 PM.
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,149
From: SW Florida
2021 C6 of the Year Finalist - Modified
If you keep your stock exhaust manifolds, I would think that the S type might be the best option.
With headers, the car will be a little louder, so that's why I went with the Touring mufflers.
With headers, the car will be a little louder, so that's why I went with the Touring mufflers.
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 752
Likes: 0
From: Lebanon CT.
Pro
Joined: Sep 2013
Posts: 536
Likes: 62
From: New York
When I was thinking about getting new exhaust system, looked at the Corsa Sport and Borla Sport.. $1300+. Didnt wanna spend that kinda money. So I just picked up NPP mufflers for 300 bucs and I keep them open. Sounds just fine to me now.
Burning Brakes
Joined: Apr 2016
Posts: 1,120
Likes: 110
From: Chattanooga TN
I did something dumb. I had the NPP with the muffler mod on my GS. Before when I had took my car to get my headers with cats and cam installed the black friday sale was going on. An I lucked up and got a Hooker Blackheart NPP for like $1,079. I love it and the snap crackle and pop. It does drone a little but it's not super bad to me and I can close the valves with the NPP in a box when I want to. 
Le Mans Master
Joined: Sep 2014
Posts: 7,001
Likes: 988
From: lake havasu city arizona
I had the NPP muffler option on my GS, but now have Borla 'Touring' mufflers instead ....
___________________________
I have always liked the NPP mufflers that came on my GS ... until I installed a set of headers on the car.
During normal driving the car was really no louder with the headers and the NPP as it was with the stock exhaust manifolds and the NPP.
The big problem was at wide open throttle (WOT) ... When the NPP valves would open fully at WOT, the car was just obnoxiously loud when I installed headers.
The only fix was to remove the NPP mufflers and install a set of Borla 'Touring' mufflers.
Now the car don't attract so much attention when at WOT ... It sill has a nice sound, but not that "In Your Face" noise anymore when you put your foot in it.
I'm happy
___________________________
I have always liked the NPP mufflers that came on my GS ... until I installed a set of headers on the car.
During normal driving the car was really no louder with the headers and the NPP as it was with the stock exhaust manifolds and the NPP.
The big problem was at wide open throttle (WOT) ... When the NPP valves would open fully at WOT, the car was just obnoxiously loud when I installed headers.
The only fix was to remove the NPP mufflers and install a set of Borla 'Touring' mufflers.
Now the car don't attract so much attention when at WOT ... It sill has a nice sound, but not that "In Your Face" noise anymore when you put your foot in it.
I'm happy
I admit mine is loud when NPP is open and too quiet when closed but that's why I like having the remote option. Plus I find it not as bad if the windows are down, the drone that is, but Mama likes them up of course. So when I'm by myself guess where the windows are, DOWN !!!!
But I love the raspyiness that it has just the way it is
NSF