NPP vs. Aftermarket Cats
Thread Starter
Pro
Joined: May 2006
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From: New York
NPP vs. Aftermarket Cats
Hi, looking to buy a new '08, but I am undecided on weather I should order the car with the factory NPP exhaust or order it with the standard exhaust, pull it off and go with an aftermarket cat back system like Borla or Corsa? What would give more HP? Is the NPP worth the extra $.
Thanx!!!
Thanx!!!
Race Director
Joined: Jan 2005
Posts: 13,656
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From: Bay Shore, NY 11706 MILD2WILD (M2W)
St. Jude Donor '06-'07
This discussion happens once a week. You cannot ask someone else to tell you the best sound for your C6 as you should not ask which color is best (both are like asking someone to pick out your wife). You need to go out and hear them; I can tell you that with 7,000+ NPP systems in use you don't see many for sale and the personal reviews of NPP have been 99% "best move I made", "it's a keeper". With the resale value of NPP take offs you would only lose a hundred if you took them off and sold them. Better news is if you did take them off and go for the B&B fusion (aftermarket bi-mode) the controls and all plumbing is in place saving you from $175 - $250.
Thread Starter
Pro
Joined: May 2006
Posts: 643
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From: New York
This discussion happens once a week. You cannot ask someone else to tell you the best sound for your C6 as you should not ask which color is best (both are like asking someone to pick out your wife). You need to go out and hear them; I can tell you that with 7,000+ NPP systems in use you don't see many for sale and the personal reviews of NPP have been 99% "best move I made", "it's a keeper". With the resale value of NPP take offs you would only lose a hundred if you took them off and sold them. Better news is if you did take them off and go for the B&B fusion (aftermarket bi-mode) the controls and all plumbing is in place saving you from $175 - $250.
Race Director
Joined: Jan 2005
Posts: 13,656
Likes: 7
From: Bay Shore, NY 11706 MILD2WILD (M2W)
St. Jude Donor '06-'07
Thanks for your answer. However, if you READ my post I DID NOT ask ANYTHING about the sound they both create. I realize that is totally subjective. What I asked for was the HP GAINS. Assuming the same car without any mods, what is the best system for HP GAINS? As for picking my wife, thats uncalled for! I pick my own wife not you or anyone else! Lets READ the posts AND stick to the topics!
The wife and color were not addressed to you personally so lighten up.1. looking to buy a new '08, but I am undecided on weather I should order the car with the factory NPP exhaust or order it with the standard exhaust, pull it off and go with an aftermarket cat back system like Borla or Corsa?
2. What would give more HP?
3. Is the NPP worth the extra $.
PS :answer to #2 is about 6hp either way
Last edited by Pipedreams; Mar 31, 2008 at 09:00 AM.
Thread Starter
Pro
Joined: May 2006
Posts: 643
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From: New York
I think I read it correctly, you have 3 seperate questions: and I addressed 1 and 3. The wife and color were not addressed to you personally so lighten up.
1. looking to buy a new '08, but I am undecided on weather I should order the car with the factory NPP exhaust or order it with the standard exhaust, pull it off and go with an aftermarket cat back system like Borla or Corsa?
2. What would give more HP?
3. Is the NPP worth the extra $.
PS :answer to #2 is about 6hp either way
The wife and color were not addressed to you personally so lighten up.1. looking to buy a new '08, but I am undecided on weather I should order the car with the factory NPP exhaust or order it with the standard exhaust, pull it off and go with an aftermarket cat back system like Borla or Corsa?
2. What would give more HP?
3. Is the NPP worth the extra $.
PS :answer to #2 is about 6hp either way
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 27
From: Austin Texas
How much of the 6HP increase is from the extra muffler outlet and how much is from Chevy manipulating timing and A/F ratios @ 3500RPM when the second pipe opens?
Have any Tuners checked to see if there is a modification of the stock tune with the NPP exhaust?
Have any Tuners checked to see if there is a modification of the stock tune with the NPP exhaust?
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Thanks for your answer. However, if you READ my post I DID NOT ask ANYTHING about the sound they both create. I realize that is totally subjective. What I asked for was the HP GAINS. Assuming the same car without any mods, what is the best system for HP GAINS? As for picking my wife, thats uncalled for! I pick my own wife not you or anyone else! Lets READ the posts AND stick to the topics!
Statistical inference these days shows that pre-arranged marriages have just as much a chance of success as one in which you choose your own woman, however, you will note that many pre-arranged ones can be more profitable leaving you with the money to buy the exhaust of your choice.
One memebr saw a 2hp peak gain from a Z06 NPP on his 3" header system and 9rwtq under the curve. Note that when the valves were closed they took 15HP off the table since 1/2 the muffler is dedicated to the flow-through system.
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Thread Starter
Pro
Joined: May 2006
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From: New York
Is that a New York response or what??!!
Statistical inference these days shows that pre-arranged marriages have just as much a chance of success as one in which you choose your own woman, however, you will note that many pre-arranged ones can be more profitable leaving you with the money to buy the exhaust of your choice.
One memebr saw a 2hp peak gain from a Z06 NPP on his 3" header system and 9rwtq under the curve. Note that when the valves were closed they took 15HP off the table since 1/2 the muffler is dedicated to the flow-through system.
Statistical inference these days shows that pre-arranged marriages have just as much a chance of success as one in which you choose your own woman, however, you will note that many pre-arranged ones can be more profitable leaving you with the money to buy the exhaust of your choice.
One memebr saw a 2hp peak gain from a Z06 NPP on his 3" header system and 9rwtq under the curve. Note that when the valves were closed they took 15HP off the table since 1/2 the muffler is dedicated to the flow-through system.
Melting Slicks
Joined: Mar 2001
Posts: 2,980
Likes: 282
From: Tulsa OK
I know this isn't what you asked, but I opted to get the base exhaust and then spend that money toward longtube headers after I get the car. Headers cost a little more than a cat-back (either factory or aftermarket), but the performance increase is much greater. 
Thread Starter
Pro
Joined: May 2006
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From: New York
I would love to add headers and a bunch of other mods, but I am concerned about voiding the warranty. With my luck something will break down on the car that costs big $ and GM will say sorry you lost your warranty when you added the mods. Oh, decisions, decisions!
Race Director
Joined: Mar 2007
Posts: 11,331
Likes: 18
From: Missouri City Texas
If you dont care about sound then it doesnt matter. HP will be close.
If you do care about sound then I would get an aftermarket system over the NPP, which I think still sounds pretty weak.
If you do care about sound then I would get an aftermarket system over the NPP, which I think still sounds pretty weak.
Drifting
Joined: Sep 2007
Posts: 1,480
Likes: 45
This discussion happens once a week. You cannot ask someone else to tell you the best sound for your C6 as you should not ask which color is best (both are like asking someone to pick out your wife). You need to go out and hear them; I can tell you that with 7,000+ NPP systems in use you don't see many for sale and the personal reviews of NPP have been 99% "best move I made", "it's a keeper". With the resale value of NPP take offs you would only lose a hundred if you took them off and sold them. Better news is if you did take them off and go for the B&B fusion (aftermarket bi-mode) the controls and all plumbing is in place saving you from $175 - $250.
1. pics
2. performance??
Pro
Joined: Jul 2004
Posts: 505
Likes: 1
From: peoria AZ
Npp/b&b
back to back 2008 NPP~ M2W OPEN & friends 2005 B&B fusion???
bearly one DB's in sound to B&B???if it wear my money???
No Question 2008 NPP/ money I save I'd cut those lil Tips & go W/Round
4 Inch, just the best??
ps.Fab I still love U Man.
Burning Brakes
Joined: Sep 2005
Posts: 1,066
Likes: 0
From: Canonsburg home of Yenko Chevy (gone but not forgotten) Western PA
This discussion happens once a week. You cannot ask someone else to tell you the best sound for your C6 as you should not ask which color is best (both are like asking someone to pick out your wife). You need to go out and hear them; I can tell you that with 7,000+ NPP systems in use you don't see many for sale and the personal reviews of NPP have been 99% "best move I made", "it's a keeper". With the resale value of NPP take offs you would only lose a hundred if you took them off and sold them. Better news is if you did take them off and go for the B&B fusion (aftermarket bi-mode) the controls and all plumbing is in place saving you from $175 - $250.
Did you get up on the wrong side of the bed today?
Melting Slicks
Joined: Feb 2004
Posts: 3,307
Likes: 111
From: Tucson AZ
I have changed my mind, I now would not order the NPP.
I have driven both an NPP and a Corsa cat back system quite a lot, and I have now changed my mind. I would save the $1195 cost for NPP and not order it. You can install a cat back system without voiding the warranty (Chevy even sells a cat back).
The Corsa works so well; it is quiet under light throttle, yet loud enough under acceleration. Their noise cancelation technology is just about perfect.
Also, if you check with your service manager, most will allow headers if they install them.
The Corsa works so well; it is quiet under light throttle, yet loud enough under acceleration. Their noise cancelation technology is just about perfect.
Also, if you check with your service manager, most will allow headers if they install them.
Race Director
Joined: Jan 2005
Posts: 13,656
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From: Bay Shore, NY 11706 MILD2WILD (M2W)
St. Jude Donor '06-'07
It's the truth, I have seen people that never heard NPP say they suck or people that had other systems say "no drone" IMO don't ask people questions like this you will never be happy in the long run.
You want the truth or you want some opinions from people that spent $1200+ on an exhaust system and wont admit they suck
Drifting
Joined: Jul 2003
Posts: 1,320
Likes: 45
From: Atlanta, GA.
This is the way I went as well. Then bought a 3" Z06 CB to add to the 3" exhaust system. No idea on power before and after but I like the mild-to-wild switching ability. Used (08) Z06 CB purchased for $250 vs. $1500 for the NPP (2.5") system.