MBRP 89-91 Honda TRX 300 FourTrax Direct Repl. Slip-On Exhaust w/Utility Mffler (Req. Head Pipe Cut)MBRP 89 91 Honda TRX 300 FourTrax Direct Repl. Slip On Exhaust w Utility Mffler (Req. Head Pipe Cut) Performance Sound In A Simple Package Directly replace your OEM muffler with an MBRP Utility Series exhaust, and hear the voice your ATV or SXS should have had from the factory. ATV Exhaust System With Utility Muffler; Slip On; Direct Replacement; 1. 25 in. Inlet; 3. 5 in. Diameter Body; Chambered Muffler; Chambered Muffler. Requires Head Pipe To Be