Added NPP Exhaust to 1LE Dyno Comparison - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Southern Comfort · 09-03-2013, 12:52 PM

2013 1LE Standard then changed to NPP

Test conditions:

The same car and same dyno were used for both tests.
No air quality info available, but the first day was mild for late August in GA. The second day was a little warmer and more humid.
Stock Exhaust test 8/29 10:45 - 2 pulls
NPP Exhaust test 8/30 10:15 - 2 pulls
DynoJet 224X (Vengeance Racing, Cumming GA)

Notable items:

Got the NPPs from Ofer at 2SSRS@Gen5diy.
No vacuum lines connected to the NPP mufflers. They are spring loaded and stay wide open at all times.
Oil and filter changed between tests. (first oil change)
Approximately 30 minutes drive to the dyno.
Tested within 15 mins of arrival.
Less than 100 miles between dyno tests.
No fuse pulls or ECU resets within several weeks of this testing.

Six videos attempting to capture the sound differences:

http://www.youtube.com/playlist?list...wwx0KROmJmXGIU

Blue is Standard Exh - Red is NPP Exh

gajagfan · 09-03-2013, 01:00 PM

Thank you for doing this. Not having air quality hurts the analysis, and I am sure the heat and humidity of the second day had an effect, and we have no idea on barometric pressure, but I think it supports the my theory that the NPP system is worth little to nothing in terms of power. For those that like the noise, it may still be the best bang for the buck. Again thanks for the effort. Very interesting.

Bad70supreme · 09-03-2013, 01:28 PM

What I see is 10 more HP at peak revs, and a tade more tq! Even though peak numbers are the same, you can see that up top the engine is breathing and pulling a tad stronger! I would not say it does nothing for power when it clearly does... Add some mods and that top end with the NPP exhaust will start to show even more! So if you want to keep a bone stock car it's fine, but add standard boltons I would want the NPP as I think it would clearly perform better.

Southern Comfort · 09-03-2013, 01:47 PM

Quote:

Originally Posted by Bad70supreme

What I see is 10 more HP at peak revs, and a tade more tq! Even though peak numbers are the same, you can see that up top the engine is breathing and pulling a tad stronger! I would not say it does nothing for power when it clearly does... Add some mods and that top end with the NPP exhaust will start to show even more! So if you want to keep a bone stock car it's fine, but add standard boltons I would want the NPP as I think it would clearly perform better.

Ron at Vengeance pointed out the same and marked the graph accordingly.

gajagfan · 09-03-2013, 01:50 PM

Quote:

Originally Posted by Bad70supreme

What I see is 10 more HP at peak revs, and a tade more tq! Even though peak numbers are the same, you can see that up top the engine is breathing and pulling a tad stronger! I would not say it does nothing for power when it clearly does... Add some mods and that top end with the NPP exhaust will start to show even more! So if you want to keep a bone stock car it's fine, but add standard boltons I would want the NPP as I think it would clearly perform better.

Making a bit more power past the shift point does not mean much to me. I am all for non-stock cars, but kind of like to see a bit more bang for the buck. I am not knocking anyone that went the NPP route, I just can not justify it. I do see your point if cam and head mods are made and shift points are going to be raised. It may make a difference at that point, but then I would think a complete exhaust system would be in order.

dixonk · 09-03-2013, 01:53 PM

Only real benefit I see is looks and weight.

Southern Comfort · 09-03-2013, 02:09 PM

Quote:

Originally Posted by dixonk

Only real benefit I see is looks and weight.

I realize it's a matter of taste, but the change in sound is a significant benefit IMO

2cnd chance · 09-03-2013, 02:37 PM

Could it benefit from a CAI system? Maybe if the engine breathed in better the benefit would be more manifest.

Bad70supreme · 09-03-2013, 02:58 PM

Quote:

Originally Posted by gajagfan

Making a bit more power past the shift point does not mean much to me. I am all for non-stock cars, but kind of like to see a bit more bang for the buck. I am not knocking anyone that went the NPP route, I just can not justify it. I do see your point if cam and head mods are made and shift points are going to be raised. It may make a difference at that point, but then I would think a complete exhaust system would be in order.

No catback is a good bang for the buck on a stock car. It's nice for a factory upgrade and definetly sounds how it should! The stock SS exhaust Sucks, so if I were to buy a 1le I personally would have liked to have the NPP. I just built a 3" system for my car and it made a huge difference over the stock pipes I had, but my car has a cam.

Anaconda · 09-03-2013, 03:03 PM

Quote:

Originally Posted by Southern Comfort

I realize it's a matter of taste, but the change in sound is a significant benefit IMO

Did you get a chance to weigh it? Not sure if anyone has made a concrete difference in weight between the stock exhaust vs NPP. Just curious.

TPAJETSKI · 09-03-2013, 03:08 PM

No way I could justify almost a grand for that. It may not sound as refined but changing mufflers or muffler delete seems like a better move from a financial standpoint. The twin pipes look cool. Just not 1K dollar cool.

gajagfan · 09-03-2013, 03:08 PM

Quote:

Originally Posted by Bad70supreme

No catback is a good bang for the buck on a stock car. It's nice for a factory upgrade and definetly sounds how it should! The stock SS exhaust Sucks, so if I were to buy a 1le I personally would have liked to have the NPP. I just built a 3" system for my car and it made a huge difference over the stock pipes I had, but my car has a cam.

When you say sucks, are you referring to performance with stock HP, performance with modified HP, or sound?

Southern Comfort · 09-03-2013, 03:16 PM

Quote:

Originally Posted by TPAJETSKI

No way I could justify almost a grand for that. It may not sound as refined but changing mufflers or muffler delete seems like a better move from a financial standpoint. The twin pipes look cool. Just not 1K dollar cool.

Can you share your 1k dollar reference?
I have $600 in this not counting the oil change or dyno time.

*Camaro_Corvette* · 09-03-2013, 03:21 PM

Quote:

Originally Posted by gajagfan

Thank you for doing this. Not having air quality hurts the analysis, and I am sure the heat and humidity of the second day had an effect, and we have no idea on barometric pressure, but I think it supports the my theory that the NPP system is worth little to nothing in terms of power. For those that like the noise, it may still be the best bang for the buck. Again thanks for the effort. Very interesting.

I guess that's better than what you have said in the past. Glad we can finally put this to rest. Every little bit counts...

Quote:

Originally Posted by gajagfan

Make no istake, NPP frees up no horsepower. NONE! You folks need to stop it. NPP is the modern day equivelent to glass packs!

Seems like it adds 9 to me....

09-03-2013, 12:52 PM	#1
Southern Comfort No Tags/Habitual Violator Drives: 2012 SIM 2SS/RS & z71 Join Date: Sep 2011 Location: North Georgia Posts: 2,379 View My Garage	Added NPP Exhaust to 1LE Dyno Comparison 2013 1LE Standard then changed to NPP Test conditions: The same car and same dyno were used for both tests. No air quality info available, but the first day was mild for late August in GA. The second day was a little warmer and more humid. Stock Exhaust test 8/29 10:45 - 2 pulls NPP Exhaust test 8/30 10:15 - 2 pulls DynoJet 224X (Vengeance Racing, Cumming GA) Notable items: Got the NPPs from Ofer at 2SSRS@Gen5diy. No vacuum lines connected to the NPP mufflers. They are spring loaded and stay wide open at all times. Oil and filter changed between tests. (first oil change) Approximately 30 minutes drive to the dyno. Tested within 15 mins of arrival. Less than 100 miles between dyno tests. No fuse pulls or ECU resets within several weeks of this testing. Six videos attempting to capture the sound differences: http://www.youtube.com/playlist?list...wwx0KROmJmXGIU Blue is Standard Exh - Red is NPP Exh Attached Images Last edited by Southern Comfort; 09-27-2013 at 04:43 AM. Reason: added youtube video

09-03-2013, 01:28 PM	#3
Bad70supreme Drives: 2010 aqua blue SS/RS M6 Join Date: Feb 2010 Location: plainfield, IL Posts: 2,706	What I see is 10 more HP at peak revs, and a tade more tq! Even though peak numbers are the same, you can see that up top the engine is breathing and pulling a tad stronger! I would not say it does nothing for power when it clearly does... Add some mods and that top end with the NPP exhaust will start to show even more! So if you want to keep a bone stock car it's fine, but add standard boltons I would want the NPP as I think it would clearly perform better. __________________ 10.91 at 122 H/C stock block N/A

09-03-2013, 02:37 PM	#8
2cnd chance Too Many Great Choices Drives: Grand Sport/Z07 Join Date: Jun 2009 Location: A Mountain Road Posts: 7,454	Could it benefit from a CAI system? Maybe if the engine breathed in better the benefit would be more manifest. __________________

09-03-2013, 01:00 PM	#2
gajagfan Drives: 2013 1SS 1LE Black - Std Exhaust Join Date: Mar 2013 Location: Brunswick, GA Posts: 3,622 View My Garage	Thank you for doing this. Not having air quality hurts the analysis, and I am sure the heat and humidity of the second day had an effect, and we have no idea on barometric pressure, but I think it supports the my theory that the NPP system is worth little to nothing in terms of power. For those that like the noise, it may still be the best bang for the buck. Again thanks for the effort. Very interesting.

09-03-2013, 01:53 PM	#6
dixonk Drives: 2011 Audi Q7 Join Date: Mar 2013 Location: Elk Grove, CA Posts: 1,084	Only real benefit I see is looks and weight.

09-03-2013, 03:08 PM	#11
TPAJETSKI Drives: Camaro Join Date: Apr 2012 Location: Florida Posts: 710	No way I could justify almost a grand for that. It may not sound as refined but changing mufflers or muffler delete seems like a better move from a financial standpoint. The twin pipes look cool. Just not 1K dollar cool.