40 Series - 2.50 Offset In / 2.50 Center Out - Aggressive Sound 2013-gmc-sierra-2500-hd-slt-esi3842735 they quickly connect to the

they quickly connect to the mobile app via Bluetooth

5 SG-BLK MILL +12

Proper timing can mean the difference between winning and losing a race or even blowing an engine (as a worst-case scenario)

Premium Clamps and a Silicone Coupling Provide a Secure Seal

Snap-On Color and Beam Changing Covers Available

40 Series - 2.50 Offset In / 2.50 Center Out - Aggressive Sound 2013-gmc-sierra-2500-hd-slt-esi3842735 they quickly connect to theThe Original 40 series muffler delivers an aggressive exterior and interior tone. If you're looking for that original Flowmaster sound, this is the muffler is for you. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.