I was able to ride the 550 on the highway and it is night and difference with the cams. I still haven't got the jets dialed just right, but even with the bike running rich it has much more pull on the top end. Prior to the cams the bike would run out of steam around 75-80 (the bike was admittedly neglected, so just having the valve adjusted may have corrected that) but with the FJ600 cams it pulls well pas burying the speedometer (85mph). Hopefully once spring rolls around I can get the jets dialed in 100% and really enjoy the bike to its fullest potential. These had to have been worth at least 5-10rwhp power gain from where it was. I was worried that it would lose some low-end torque, but it still pulls hard from ~2500+ where the bike spends most of its time.