This is the M4. Fully tunable 3x14" silencer with 5 tunable inserts to adjust back pressure. Redesigned inlet and outlet for improved durability. Continuous Roving Packing Material. Perfect for Stock or Modified Moto engines. Fits the RLV R4/R5 with 1" inlets pipes.
Tuning Inserts Included: 0.75", 0.83", 0.87", 0.9", 0.925
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