aFe Mach Force XP 49-44054-P Fits:GMC 2015 - 2015 SIERRA 3500 HD BASE V8 6.6 Cr Weight: 55 Fitment: GMC 2015 - 2015 SIERRA 3500 HD BASE V8 6.6 Crew Cab Pickup; 78.8in Bed Length; 133.6in Wheelbase; 2015 - 2015 SIERRA 3500 HD BASE V8 6.6 Crew Cab Pickup; 78.8in Bed Length; 167.7in Wheelbase; 2015 - 2015 SIERRA 3500 HD BASE V8 6.6 Crew Cab Pickup; 97.6in Bed Length; 133.6in Wheelbase; 2015 - 2015 SIERRA 3500 HD BASE V8 6.6 Crew Cab Pickup; 97.6in Bed Length; 167.7in Wheelbase; 2015 - 2015 SIERRA 3500 HD BASE V8 6.6 Extended Cab Pickup; 78.8in Bed Length; 133.6in Wheelbase; 2015 - 2015 SIERRA 3500 HD BASE V8 6.6 Extended Cab Pickup; 78.8in Bed Length; 167.7in Wheelbase; 2015 - 2015 SIERRA 3500 HD BASE V8 6.6 Extended Cab Pickup; 97.6in Bed Length; 133.6in Wheelbase; 2015 - 2015 SIERRA 3500 HD BASE V8 6.6 Extended Cab Pickup; 97.6in Bed Length; 167.7in Wheelbase; 2015 - 2015 SIERRA 3500 HD BASE V8 6.6 Standard Cab Pickup; 78.8in Bed Le...