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Old 01-21-2012, 10:24 PM   #3
Drives: 2010 ABM SS/RS
Join Date: Nov 2010
Location: Prairieville, LA
Posts: 491
Correct me if im wrong, but I'm not totally sure that you'll gain any power with opening cutouts. If anything, you'd lose some torque. I think they're purely for sound. There really isn't any restriction at the mufflers. An aftermarket axle back might net you 2-4 rwhp. A cat-back only 6-12 hp. Most of the restriction comes at the stock exhaust manifold and cats.
Vararam Tune CAI, Vararam Power Wedge, 160 degree stat, VMax ported throttle body, Ceramic coated ARH 1 7/8" LTs with X-pipe, Borla S-Type Axle back, MGW short throw, 3.91s, Ported stock IM, BTR Stage IV cam, Heritage Grille, Backup camera, UMI Performance trailing arms and toe rods, dyno tune
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