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Old 06-24-2013, 11:29 PM   #1
trw427ss @ Futral
trw427ss @ Futral's Avatar
Drives: 2013 2SS/RS L99
Join Date: Oct 2012
Location: Denham Springs La.
Posts: 693
Thumbs up 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! It has a deeper tone at idle than the L99 and is not as raspy at wide open throttle. Also I have 1 7/8's Stainless Power headers and no cats with both combo's.
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