I put an Arrow on my S4RT and it did improve the handling, especially comming out of the corners where the front would lighten up. Id get a little head shimmy, not too serious but enough to make me want to let-off. As a side note, this year I upgraded to a dedicated track bike, 996. Absolultly no comparision in handling over the S4R, it rails the corners where the S4R would stand-up even lightly breaking in the corners, run wind on the gas plus you had to sling it into the corners. Down side the 996 has less power than the Termi'd S4R and I get stuffed in the straights oh well.