MBRP 4" Installer Series Filter-Back Exhaust System S6059AL For 20-21 GM 6.6L Duramax L5P * * (ALL CREW & EXT. CAB) The MBRP 4" Installer Series Filter-Back Exhaust System S6059AL can reduce backpressure and lower EGTs in your 2020-2021 GM 6...
MBRP 4" Pro Series Filter-Back Exhaust System S6059304 For 2020-2021 GM 6.6L Duramax L5P ( All Crew & Ext. Cab) The MBRP 4" PRO Series Filter-Back Exhaust System S6059304 will enhance the sound and style of your 2020-2021 GM 6.6L Duramax L5P. MBRP...