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-   Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons (http://www.camaro5.com/forums/forumdisplay.php?f=11)
-   -   L99 Exhaust Versus ZL1 NPP Exhaust with LT's (http://www.camaro5.com/forums/showthread.php?t=303862)

trw427ss @ Futral 06-24-2013 10:29 PM

L99 Exhaust Versus ZL1 NPP Exhaust with LT's
 
I swapped the factory L99 exhaust out for a factory ZL1 NPP exhaust on my car. :) Dynoed before and after a couple of hours apart. The factory L99 exhaust is not to bad, the ZL1 NPP exhaust made 4rwtq and 2rwhp at peak and 4-5rwhp through the middle over the L99 Exhaust! :nod: It has a deeper tone at idle than the L99 and is not as raspy at wide open throttle. :thumbsup: Also I have 1 7/8's Stainless Power headers and no cats with both combo's. :D

CamaroSS408 06-24-2013 10:37 PM

You got it from GMPP?

mikeyg36 06-24-2013 10:38 PM

Quote:

Originally Posted by CamaroSS408 (Post 6711792)
You got it from GMPP?

:pop2:

trw427ss @ Futral 06-24-2013 10:40 PM

Quote:

Originally Posted by CamaroSS408 (Post 6711792)
You got it from GMPP?

No, got it off a ZL1.

CamaroSS408 06-24-2013 10:43 PM

I was thinking of getting this exhaust. suggestion?

trw427ss @ Futral 06-24-2013 10:54 PM

Quote:

Originally Posted by CamaroSS408 (Post 6711812)
I was thinking of getting this exhaust. suggestion?

I like it and I can run it open or closed with the flip of a switch! :D

CamaroSS408 06-24-2013 11:04 PM

cut outs too?

trw427ss @ Futral 06-24-2013 11:12 PM

Quote:

Originally Posted by CamaroSS408 (Post 6711903)
cut outs too?

NPP exhaust has a vacuum control cut out built into the muffler ( duel mode exhaust). ZL1's and 1LE cars have this.

ST1LE 06-25-2013 06:33 AM

This exhaust is an option one all manual SS's starting with 2013 models.

trw427ss @ Futral 06-25-2013 09:01 AM

Quote:

Originally Posted by ST1LE (Post 6712516)
This exhaust is an option one all manual SS's starting with 2013 models.

And standard on 2012 and up ZL1's.

DuskSS 06-25-2013 09:13 AM

yup love mine will never change it out.
sounds and performs flat NASTY with LTs and a cam. and M2W rocks.

62nalide 06-25-2013 09:28 AM

Are they 2.5" or full 3" ?

trw427ss @ Futral 06-25-2013 02:32 PM

Quote:

Originally Posted by 62nalide (Post 6712987)
Are they 2.5" or full 3" ?

They are all 2.5" (ZL1 and 1LE).

trw427ss @ Futral 06-26-2013 03:06 PM

Well so much for the 6rwhp everyone claims that NPP exhaust is worth! :sorry: But it was worth it for the sound! :D :biggrin:


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