The stock exhaust does not restrict flow or performance until you get up to around 680rwhp. This was documented by Ted of JRE about 3 years ago if you care to search back that far.
SOooo... if you buy an aftermarker catback, axleback or get the optional NPP exhuast, do it for the sound. That's all that is going to change.
Aftermarket manufacturers have reported BS gains ever since the first aftermarket was released.
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#5 - 2010 2SS/RS MN6 ABM #142-Silver Rallys-GFX / Med Titanium
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My previous Camaros:
#4 - 1994 Z/28 6M Black over Arctic White / Graphite-Red Inserts - traded
#3 - 1981 Z/28 Bright Blue Metallic / Black - sold
#2 - 1970.5 RS Mulsanne Blue / Blue - endo crashed it and parted it out
#1 - 1967 RS Butternut Yellow w/ Black Bumblebee Stripe-RPO D91 / Parchment-Black - sold
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