BRExhaust offers direct-fit replacement exhaust systems for the Freightliner MT45 across a range of model years, trims, and vehicle configurations. Designed to meet or exceed OEM fitment requirements and performance standards, BRExhaust systems restore factory exhaust function and reliability. BRExhaust kits serve as a single box solution, featuring a multi-piece design and including the pipes, mufflers, clamps, gaskets, and hardware needed for straightforward installation with no cutting, bending, welding, or fabrication required. Use Shop by Vehicle to find BRExhaust exhaust systems designed specifically for your 2012 Freightliner MT45.