It would be interesting to see a video
Headers with stock NPP???
Thread Starter
Melting Slicks
Joined: May 2009
Posts: 2,689
Likes: 1,007
From: Brookfield IL
Has anyone added long tubes but kept the stock NPP catback? I'm curious on hearing how much louder the car is with just doing this and not replacing the catback system.
If anyone has a video please post this up. Thanks!
If anyone has a video please post this up. Thanks!
Race Director
Joined: Dec 2004
Posts: 13,760
Likes: 75
From: Haymarket VA
I have ARH LT's with the NPP exhaust. With Sound Management on and in Touring or Eco mode, it's not really any louder than stock. Turn Sound Managment off and and you get a nice rumble at low RPM but mash the loud pedal and the Gates of Hell open. 
It's the best of both worlds.
It's the best of both worlds.
Last edited by Steve Garrett; Sep 1, 2014 at 10:46 PM.
Thread Starter
Melting Slicks
Joined: May 2009
Posts: 2,689
Likes: 1,007
From: Brookfield IL
I have ARH LT's with the NPP exhaust. With Sound Management on and in Touring or Eco mode, it's not really any louder than stock. Turn Sound Managment of and and you get a nice rumble at low RPM but mash the loud pedal and the Gates of Hell open. It's the best of both worlds.
It's the best of both worlds. 
Melting Slicks
Joined: Jun 2013
Posts: 2,598
Likes: 1,593
I've become skeptical about aftermarket exhaust systems. 20 years ago, manufacturers often compromised performance for issues like emission control, noise, longevity and of course cost. There was legitimate bolt-on HP available from performance exhaust tuning.
But technology has advanced, and especially on performance cars, competition has forced manufacturers to put their best foot forward, and put really efficient exhaust systems on cars.
A few years ago, I read an article where several popular aftermarket exhaust systems were dyno'd against the factory system on then new 911 Porsche, and the take-away was that the aftermarket systems added no useful performance... they were just louder, and or introduced annoying resonances.
The performance aftermarket is not really regulated... they can make any claims they want, and many of them are shameless in misrepresenting their products.
I find it hard to believe that two dudes in a garage are smarter than the entire Porsche or Corvette engineering department. Before I spend thousands on an new exhaust system, I'd want to see some credible third party dyno data.
But technology has advanced, and especially on performance cars, competition has forced manufacturers to put their best foot forward, and put really efficient exhaust systems on cars.
A few years ago, I read an article where several popular aftermarket exhaust systems were dyno'd against the factory system on then new 911 Porsche, and the take-away was that the aftermarket systems added no useful performance... they were just louder, and or introduced annoying resonances.
The performance aftermarket is not really regulated... they can make any claims they want, and many of them are shameless in misrepresenting their products.
I find it hard to believe that two dudes in a garage are smarter than the entire Porsche or Corvette engineering department. Before I spend thousands on an new exhaust system, I'd want to see some credible third party dyno data.
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 921
From: Lehigh Acres FL
Tech Contributor
I've become skeptical about aftermarket exhaust systems. 20 years ago, manufacturers often compromised performance for issues like emission control, noise, longevity and of course cost. There was legitimate bolt-on HP available from performance exhaust tuning.
But technology has advanced, and especially on performance cars, competition has forced manufacturers to put their best foot forward, and put really efficient exhaust systems on cars.
A few years ago, I read an article where several popular aftermarket exhaust systems were dyno'd against the factory system on then new 911 Porsche, and the take-away was that the aftermarket systems added no useful performance... they were just louder, and or introduced annoying resonances.
The performance aftermarket is not really regulated... they can make any claims they want, and many of them are shameless in misrepresenting their products.
I find it hard to believe that two dudes in a garage are smarter than the entire Porsche or Corvette engineering department. Before I spend thousands on an new exhaust system, I'd want to see some credible third party dyno data.
But technology has advanced, and especially on performance cars, competition has forced manufacturers to put their best foot forward, and put really efficient exhaust systems on cars.
A few years ago, I read an article where several popular aftermarket exhaust systems were dyno'd against the factory system on then new 911 Porsche, and the take-away was that the aftermarket systems added no useful performance... they were just louder, and or introduced annoying resonances.
The performance aftermarket is not really regulated... they can make any claims they want, and many of them are shameless in misrepresenting their products.
I find it hard to believe that two dudes in a garage are smarter than the entire Porsche or Corvette engineering department. Before I spend thousands on an new exhaust system, I'd want to see some credible third party dyno data.
SSidekickbp, I watched a video of a C7 with ARH long tubes and NPP on here a while ago. Let me dig up the vid for you. It's actually what I am doing to mine as soon as I finish my order with Ben at WeaponX..
Le Mans Master
Joined: Oct 2004
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From: Haymarket Virginia
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I'm Batman..
Joined: Apr 2014
Posts: 6,142
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From: Lehigh Acres FL
Tech Contributor
Advanced
Joined: Jan 2014
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Likes: 2
Stainless Works in Ohio installed headers and a double x pipe on my C7 while retaining the NPP exhaust from the axle back. Could not be happier with the tone and how much louder it is. It did throw the check engine light but I had the car tuned which eliminated it. Below is a link to a video they took. Tune and headers produced +40rwhp on the dyno. It definitely has a raw sound that is clearly not stock. And of course the baffles still quiet it down whenever I'd like (never). Here's the link to the video.