I also bought the ARH headrs and catted x-pipe, sticking w/ stock mufflers for now, have the L99 and it will not sound too pretty w/ aftermarket mufflers when it switches to 4cl mode. The L99 mufflers were designed to help w/ this. Soon as the AFM is tuned out though I will most likely add aftermarket mufflers.
2010 SS L99, 536rwhp firstname.lastname@example.org. Whipple Supercharger stock pulley, ARH 1 7/8 longtubes w/ catted xpipe, magnaflow 3" mufflers, ADM Race CAI, 3:70 gears, lightweight wheels and nitto drag radials. Stock internal L99, stock converter.
Bolt on best before blower email@example.com w/ nothing but ARH headers, catted x-pipe, ADM CAI and a tune on stock Pzero`s!
Other car 2008 C6 Ls3, z51, A6, Npp Exhaust, best bonestock pass firstname.lastname@example.org, Number 2 on the Corvette Forums Bonestock fastest list..