Why is Chevy not advertising a horsepower boost with the NPP exhaust?

Cars and Tea · 09-13-2015, 10:11 PM

Why is Chevy not advertising a horsepower boost with the NPP exhaust?

They did on the C7 and its the same engine, LT1, with the same exhaust code, NPP.

WHAMMO · 09-13-2015, 10:13 PM

Yeah I dont get it too.

cyberbro · 09-13-2015, 10:19 PM

Maybe they didn't achieve one, maybe they are waiting.
Whole lot of info was not said yet about the car.

*DGthe3* · 09-13-2015, 10:29 PM

Alternatively, it could be that the 455 that they've been advertising is with the performance exhaust & it might be 450 (or so) without.

But really, does it actually matter? If there is any gains, its going to be roughly 5 hp. Thats not going to do anything to appreciably change the performance of the SS. It might make people feel better to quote a higher hp number ... but a 1% difference isn't going to have any real effect on how quick the car is.

danman_s · 09-13-2015, 11:46 PM

Quote:

Originally Posted by DGthe3

Alternatively, it could be that the 455 that they've been advertising is with the performance exhaust & it might be 450 (or so) without.

But really, does it actually matter? If there is any gains, its going to be roughly 5 hp. Thats not going to do anything to appreciably change the performance of the SS. It might make people feel better to quote a higher hp number ... but a 1% difference isn't going to have any real effect on how quick the car is.

I could have sworn that sounding louder = faster car, haha.

GroundhogSS · 09-14-2015, 12:25 AM

Quote:

Originally Posted by danman_s

I could have sworn that sounding louder = faster car, haha.

Sounds good to me.

Cars and Tea · 09-19-2015, 08:46 PM

Quote:

Originally Posted by DGthe3

Alternatively, it could be that the 455 that they've been advertising is with the performance exhaust & it might be 450 (or so) without.

But really, does it actually matter? If there is any gains, its going to be roughly 5 hp. Thats not going to do anything to appreciably change the performance of the SS. It might make people feel better to quote a higher hp number ... but a 1% difference isn't going to have any real effect on how quick the car is.

That would suck for the non-NPP people.

ilirg · 09-19-2015, 10:50 PM

Quote:

Originally Posted by Cars and Tea

That would suck for the non-NPP people.

I've never seen any one including GM advertise their HP ratings unless marked with a asterisks for their engines with a performance exhaust. I highly highly doubt they would start now.

Number 3 · 09-20-2015, 08:23 AM

They've added the exhaust to the 2016 SS as well and thus far they've stuck with the 415 for the LS3. No mention of a bump.

The only reason I can think of is that it requires a certified dyno test.

Also, I don't think the C7 mentions a HP bump does it? I'm going to go check.

Yep, C7 gives a bump from 455 to 460.

joemosfet · 09-20-2015, 01:39 PM

C7 uses equal length cast iron manifolds.

It's possible that the NPP exhaust system allows the manifolds to flow a bit better, thus gaining 5hp, while the Camaro, with it's tri-y headers, may not have any gains from NPP.

However, my guess is SAE certification for horsepower is expensive, and seeing as they've already done it on the Corvette, consumers will already have an idea that NPP adds 5hp.

fastball · 09-21-2015, 08:34 AM

Quote:

Originally Posted by DGthe3

Alternatively, it could be that the 455 that they've been advertising is with the performance exhaust & it might be 450 (or so) without.

If that's the case, nothing like irritating your customer base by misguided PR.

juzefzoozoo · 09-21-2015, 08:37 AM

Quote:

Originally Posted by DGthe3

Alternatively, it could be that the 455 that they've been advertising is with the performance exhaust & it might be 450 (or so) without.

But really, does it actually matter? If there is any gains, its going to be roughly 5 hp. Thats not going to do anything to appreciably change the performance of the SS. It might make people feel better to quote a higher hp number ... but a 1% difference isn't going to have any real effect on how quick the car is.

Uh, Yes. It does matter actually.

Ragnar · 09-21-2015, 01:13 PM

All 5th Gen SS LS3's were rated for the same hp. You would have to think that electric assisted power steering and NPP would add something to the LS3.

The NPP for the Camaro was developed from the ZL1. I guess it was good enough to have as an option for the manual packages and still good enough for the Z28! I'm glad that I ordered it on my car, I would want it again.

Now, 6th Gen offers it right away and with more packages! I can't wait to here one in person.

ParisTNDude · 09-22-2015, 08:15 AM

Quote:

Originally Posted by DGthe3

Alternatively, it could be that the 455 that they've been advertising is with the performance exhaust & it might be 450 (or so) without.

But really, does it actually matter? If there is any gains, its going to be roughly 5 hp. Thats not going to do anything to appreciably change the performance of the SS. It might make people feel better to quote a higher hp number ... but a 1% difference isn't going to have any real effect on how quick the car is.

The LS3 engines in C6 Corvettes were rated at 430 HP and increased to 436 HP with the addition of the NPP exhaust.

Most of us spend a lot of money on axle back exhaust systems where the manufacturer claims as much as a 15 HP increase, but I doubt anyone could prove that with a dyno comparison of before and after. However, if you're a drag racer and .001 improvement in your ETs wins a race, you might appreciate 6 HP.

I'm confident the new engine is much more efficient than the LS3 and the HP increase with NPP may not be measurable. I added the remote actuated switch on my Grand Sport for the NPP since, when open and at steady speeds, it does have a minor drone to the exhaust sound. It doesn't bother me, but my wife wouldn't like it so I can close the valve when I want to.

09-13-2015, 10:11 PM	#1
Cars and Tea Banned Drives: 2013 Camaro 2SS/RS Join Date: Jan 2014 Location: Baltimore, MD Posts: 730	Why is Chevy not advertising a horsepower boost with the NPP exhaust? Why is Chevy not advertising a horsepower boost with the NPP exhaust? They did on the C7 and its the same engine, LT1, with the same exhaust code, NPP.

09-13-2015, 10:13 PM	#2
WHAMMO Drives: 13' 1LE Join Date: Apr 2012 Location: Canada Posts: 2,653	Yeah I dont get it too. __________________ 13' 1LE Old setup: TSP 231-236/Tick 660/.105 PR, UDP, SW LT 2'' & HFC, stock NPP & H pipe, VR-DRX CAI, air scoop, Goertz1 manifold, 102mm BBK, 26" Toyo DRs, Forgestars R17x10 & F18x8, rear seat delete, remote Pat G tune Autocal, 7400 limiter, Spec Mini Twin. 91oct. 11.90@122.3, 0-60ft 2.0 / 11.99@123.6, 0-60ft 2.1 DA+819 ...519RWHP SAE Solid roller SBE LS3, FED, LLSR, 91oct, 605rwhp N/A. Tuned by Pat G. Build by me.

09-13-2015, 10:19 PM	#3
cyberbro Drives: Not a Camaro at this time Join Date: Mar 2009 Location: Long Island, New York Posts: 1,056	Maybe they didn't achieve one, maybe they are waiting. Whole lot of info was not said yet about the car. __________________ Order Status: 2000 8/27/15 3000 9/3/15 2000 9/22/15 (Order changed) 2016 2SS With Auto, NPP, MRC, Nav, Split 5 Spoke Bright Aluminum. Last edited by cyberbro; 09-13-2015 at 10:33 PM.

09-13-2015, 10:29 PM	#4
DGthe3 Moderator.ca Drives: 05 Grand Am GT Join Date: Jul 2007 Location: Niagara, Canada Posts: 25,366	Alternatively, it could be that the 455 that they've been advertising is with the performance exhaust & it might be 450 (or so) without. But really, does it actually matter? If there is any gains, its going to be roughly 5 hp. Thats not going to do anything to appreciably change the performance of the SS. It might make people feel better to quote a higher hp number ... but a 1% difference isn't going to have any real effect on how quick the car is. __________________ Note, if I've gotten any facts wrong in the above, just ignore any points I made with them __________________ Originally Posted by FbodFather My sister's dentist's brother's cousin's housekeeper's dog-breeder's nephew sells coffee filters to the company that provides coffee to General Motors...... ........and HE WOULD KNOW!!!! __________________ Camaro Fest sub-forum

09-20-2015, 08:23 AM	#9
Number 3 Hail to the King baby! Drives: '19 XT4 2.0T & '22 VW Atlas 2.0T Join Date: Dec 2008 Location: Illinois Posts: 12,310 View My Garage	They've added the exhaust to the 2016 SS as well and thus far they've stuck with the 415 for the LS3. No mention of a bump. The only reason I can think of is that it requires a certified dyno test. Also, I don't think the C7 mentions a HP bump does it? I'm going to go check. Yep, C7 gives a bump from 455 to 460. __________________ "Speed, it seems to me, provides the one genuinely modern pleasure." - Aldous Huxley

09-20-2015, 01:39 PM	#10
joemosfet Drives: 2014 Camaro SS Join Date: Mar 2014 Location: Colorado Posts: 1,006	C7 uses equal length cast iron manifolds. It's possible that the NPP exhaust system allows the manifolds to flow a bit better, thus gaining 5hp, while the Camaro, with it's tri-y headers, may not have any gains from NPP. However, my guess is SAE certification for horsepower is expensive, and seeing as they've already done it on the Corvette, consumers will already have an idea that NPP adds 5hp. __________________ SOLD: 2014 Camaro Coupe 2SS/RS M6 Blue Ray Metallic, NPP, Nav 2014 Stingray Premiere Edition Coupe #142/500 Z51 3LT M7 Laguna Blue, Magride, NPP, Exposed Carbon Fiber Roof, Carbon Fiber Dash, Suede Wrapped Interior Canceled: 2016 Camaro Coupe 1AK37 2SS Coupe, G7E Garnet Red, BRJ Adrenaline Red Trim, F55 Magnetic Ride, NPP Exhaust, CF5 Sunroof, 56R Gray Split spoke w/ machined face, RN2 LPO Illuminated Bowtie, VYW Premium Floor Mats, W2D LPO Cargo Net

09-21-2015, 01:13 PM	#13
Ragnar Destroyed by flooding Drives: Wife's car Join Date: Mar 2014 Location: Louisiana Posts: 4,672	All 5th Gen SS LS3's were rated for the same hp. You would have to think that electric assisted power steering and NPP would add something to the LS3. The NPP for the Camaro was developed from the ZL1. I guess it was good enough to have as an option for the manual packages and still good enough for the Z28! I'm glad that I ordered it on my car, I would want it again. Now, 6th Gen offers it right away and with more packages! I can't wait to here one in person. __________________

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