Shop OEM General Motors Part # 86508525 (85580578). Exhaust Muffler. DUAL EXHAUST, 6.2 liter, crew cab 6.6 ft box. DUAL EXHAUST, crew cab, 5.8 ft box, 6.2 liter, w/o ZR2. DUAL EXHAUST, double

Exhaust Muffler. Muffler and pipe.
A Muffler without any pipes, which are typically universal in fitment.

Fits Sierra 1500, Silverado

DUAL EXHAUST, 6.2 liter, crew cab 6.6 ft box. DUAL EXHAUST, crew cab, 5.8 ft box, 6.2 liter, w/o ZR2. DUAL EXHAUST, double cab, 6.2 liter.