well i got rid of stock exhaust today and had 2 40 series put on with turndowns. they have a 2 inch inlet and a 3 inch outlet with 3 inch turndown. my cats are hi flo i believe, so it sounds wicked as hell. 
96 Silverado rcsb
5.7l Vortec
Exterior: 2 inch drop shackles, Centerline Titan 20" Wheels, clear lights, Debadged.
-Exterior to come: 2-4 drop, Tinted windows, Cowl hood, Green Calipers
-Performance mods: Flowmaster True Dual exhaust
-Performance to come: Tune, CAI, Cam, Spray, Posi, gears, stall, headers.
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