DJ NEZZ
Well-Known Member
Recently I fitted the Graves Motorsport R1/FZ1 racing velocity stacks. I could feel an uneven pulse in the low rev range. After fitting these riding around town at 3 grand rpm was smoother and seemed to match my GYTR slipon, cat gut, K&N and YEC [yamaha racing parts] AIS Plug set [5VY-A4890-70]. These stacks give 4hp more at mid and 2hp in the high rev range and are the icing on the cake.:+2:
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