Down Pipe, MBRP Exhaust Down Pipe, Cab and Non- Chassis Only., 4in. Turbo Down Pipe; T409, 4in. Turbo Down Pipe; T409 Stainless Steel., MBRP Exhaust, Get even more exhaust flow with this 4" Down Pipe., Jig Manufactured to Ensure Accuracy. Smooth Mandrel Bends to Improve Flow. Lower Exhaust Gas Temperatures., Exhaust Pipe