Down Pipe, MBRP Exhaust Down Pipe, 1998 Partial year, do not use if vehicle has a catalytic converter., 4" Inlet Outside Diameter Down Pipe Kit. AL., Aluminized 4" Inlet Outside Diameter Down Pipe Kit., MBRP Exhaust Diesel Down Pipe Kit., Power Gains. Jig Manufactured For Accuracy. Lower EGT's., Exhaust Pipe