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Old 09-03-2013, 08:57 PM   #26
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Quote:
Originally Posted by Dropspeed View Post
I purchased my NPP so I am able to control the noise level inside the cabin with a switch.....I also like the lok of the 4 tips vs 2

-Matt
+1

Reasons to like NPP especially on the 1LE:
  • It's a little lighter.
  • It adds a little bit of power.
  • You can control the exhaust noise with your garage door opener or just a fuse pull.
  • Quad tips.
  • It looks better without the big stock cans.
  • When you start your car up people look at your car. (If you like that.)
  • It sounds way better!!!!
NPP FTW!

To me much more worth it than RS.

Thank you OP for putting numbers on this debate.
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Old 09-03-2013, 09:23 PM   #27
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Interesting. Wonder if weather the same on second run more of a difference would be seen, or just good old dyno differences on a different day.Also people on this site say catbacks make no hp over stock and this one cant be better then those, so maybe some power also from catbacks other then peak? Seen axelback graphs do the same , power before and after peak but little at peak. All food for thought
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Old 09-03-2013, 10:08 PM   #28
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NPP seems great to me. It adds power,which I always knew it would but I don't understand why Chevy has not taken the time to quote the actual hp of a Camaro with NPP and also why why they haven't factored in the hp gain from the electric steering. It's pretty clear to me that a 2013-2014 SS w/ NPP probably has 441 hp or more at the crank. 10 or so for NPp and 5 for the electric steering.
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Old 09-04-2013, 01:46 AM   #29
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Is NPP offered on the 2014 SS Camaro w/ automatic tranny?
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Old 09-04-2013, 05:34 AM   #30
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Quote:
Originally Posted by tizzle_ss View Post
Is NPP offered on the 2014 SS Camaro w/ automatic tranny?
No, it can not cancel the L99 drone switching to 4 cylinders.
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Old 09-04-2013, 07:59 AM   #31
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Originally Posted by Southern Comfort View Post
Can you share your 1k dollar reference?
I have $600 in this not counting the oil change or dyno time.
I'm talking about the exhaust system which I believe the MSRP is around 900 bucks...notwithstanding anybody's haggling ability.
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Old 09-04-2013, 08:54 AM   #32
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Originally Posted by Bad70supreme View Post
That's not past the shift point, you don't shift at peak you shift a few hundred past it. So that would be valuable to have that extra 10hp at the wheels in my eyes, my car peaks at 6400 but likes to be shifted at 6700 into 3rd for best trap speed! Before my cam I ran it right up to the rev limiter for my best times.
In all my years of drag racing, I never found that to be the case. We were not that fast (10.8's), but if I took the engine past peak power, the times were never as good. It should be noted that shifting the car at 7200 RPM got you to the end of the 1/4 mile just before the rev limiter kicked in (turbo 400 manual valve body with 4500 RPM stall). If I hit the rev limiter in any gear (7400 RPM) things went very south. Your new cam most certainly may have raised the peak power point, and the NPP may benefit you. When you had the better trap speed, did you also have the best ET?
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Old 09-04-2013, 09:52 AM   #33
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Originally Posted by Scott@Bjorn3D View Post
No, it can not cancel the L99 drone switching to 4 cylinders.
Can you elaborate? What do you mean by drone switching? Im aware that the auto uses AFM when on the highway / cruise, but is the quad port exhaust not installed solely due to the sound it makes when in 4 cylinder mode (AFM) or for other reasons?
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Old 09-04-2013, 01:46 PM   #34
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Quote:
Originally Posted by gajagfan View Post
In all my years of drag racing, I never found that to be the case. We were not that fast (10.8's), but if I took the engine past peak power, the times were never as good. It should be noted that shifting the car at 7200 RPM got you to the end of the 1/4 mile just before the rev limiter kicked in (turbo 400 manual valve body with 4500 RPM stall). If I hit the rev limiter in any gear (7400 RPM) things went very south. Your new cam most certainly may have raised the peak power point, and the NPP may benefit you. When you had the better trap speed, did you also have the best ET?
I agree with you when it comes to Auto's! My th400s and my big blocks actually liked to be short shifted into 2nd gear at 5300, then taken to peak at 5600 into 3rd! This would result in my best ETs and traps, I find it different with this engine and M6. If I shift at peak or short shift 2nd like I use to, the car slows down. I tried a hole bunch of different shifts in this car, 2nd gear seems to like 6,400 mabye more if my trans would allow!! shifting 3rd I rev it to the max, I pick up et and speed. This has been the case even when the car was bone stock, I think the manual trans has allot to do with it. A little more RPMs into the next gear seems to help with not have a converter to fall back on.
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Old 09-07-2013, 07:55 AM   #35
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Old 09-08-2013, 08:45 AM   #36
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It's nice to see honest data on things like this, thanks !
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Old 09-08-2013, 12:09 PM   #37
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Quote:
Originally Posted by tizzle_ss View Post
Can you elaborate? What do you mean by drone switching? Im aware that the auto uses AFM when on the highway / cruise, but is the quad port exhaust not installed solely due to the sound it makes when in 4 cylinder mode (AFM) or for other reasons?
Yes the do not put it on do to the AFM sound. The Mufflers on a L99 and LS3 even though they look the same they are not. L99 has stuff to help with drone along with the big butt resonator in the middle of the car. NPP would sound horrible when AFM kicked in.

Trust me I would know, I had a L99 and dealt with the drone issues.
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Old 09-08-2013, 11:13 PM   #38
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I dont care that i dont pick up a ton of power over stock. It sounds great and will never have the droen of a aftermarket exhaust system on the highway.
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Old 09-11-2013, 07:50 AM   #39
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With headers, it would sound absolutly crazy and loud, but I would have the ability to control the sound. I mean its a win win.
It's actually not that crazy. It sounds amazing with the Pfadt LTs and HF cats but not ridiculously loud, even with the fuse pulled. I got a M2W controller to quiet it down enough for my wife to not complain about the very slight amount of drone when driving on the highway at 60mph in 6th gear, going up a hill.
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Old 09-16-2013, 08:26 PM   #40
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Well I for one like it on my ZL1 with a cam, headers and off road pipes it sounds great,but when it was driven in the bay at fastlane the sound bounded off the walls,and talk about freaking loud man.Although even with my top down at cruise I cant hear much at all until the hammer is dropped.lol
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Old 09-16-2013, 09:33 PM   #41
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I had the NPP ordered on my 13 ss and it is the single most pointed out feature. It could be because 5th gen Camaros have been out for a while and this is new on them but it does get a lot of attention.

6 - 10 HP difference is nothing compared to the difference a driver makes. If I were to add power I prefer a smaller gain over the entire curve than one great number at a certain rpm.
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Old 01-05-2014, 10:31 PM   #42
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Originally Posted by gajagfan View Post
If I hit the rev limiter in any gear (7400 RPM) things went very south. Your new cam most certainly may have raised the peak power point, and the NPP may benefit you. When you had the better trap speed, did you also have the best ET?
You are taking about bouncing off the rev limiter that is not the same as shifting a few hundred after the peak. Rev limiter is going to cut your power off considerably.

NPP with fuse pull is worth is even if the weight was the same and it had zero Benifit. Car sounds like it has a v8 in it.
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Old 01-05-2014, 10:40 PM   #43
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Dude....old thread
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Old 01-05-2014, 11:01 PM   #44
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Yeah!! Old thread!





































...and don't forget to factor in the slightly different rear valance, that the NPP option brings with it, 'nuff said.
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Old 01-05-2014, 11:53 PM   #45
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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.
and I actually prefer the larger single outlets on the 14s
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Old 01-06-2014, 04:45 AM   #46
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Well done Op
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Old 01-06-2014, 07:34 AM   #47
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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.
I'm less then 400 in my npp conversion. I got the npp rear diffuser for 75$ new. Still cheaper then a muffler delete axle back from slp. My used npp had a couple hundred miles on it but was still brandy new.
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Old 01-06-2014, 12:04 PM   #48
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NPP cost me almost $15K.

Was shopping for a nice used 2010 or 2011 Camaro 2SS with a 6 speed. Max I wanted to spend was $25K. Checking out a used White/Red-Stripe at my local dealership and noticed a blue 1LE they had in the lot. Sales guy fired it up and put his foot into it. I went weak in the knees and two days later I was back trying to order up my '14 1LE with NPP.

I have to wait till Feb to get mine ordered, but that's how NPP cost me almost $15K.
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Old 01-06-2014, 12:48 PM   #49
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