I have no ideas, think it's summat to so with power but Christ knows how or why..the bloke I bought it off gave me some along with the stainless straps but I doubt I'll bother. The bike was cheap because it was scruffy and had 40, 000 miles up, but it runs great and makes far more sense to me than a chromed showpiece. I'll wash it tomorrow for the first time since I've had it, cover it in acf50 then use it all through winter and wash it again in the spring. The Hyde kit does make a difference, the site claims summat like 50 percent more power and 40 percent more torque, but whilst it deffo got a lot more bite than a stock bike I doubt it's that much. Feels closer to the difference a properly piped and jetted bike has over a stocker jap. I do love it, and I like just grunting about in that piss pot that used to be me dads. I took my fz1 to BSD in Peterborough this morning to get Pirelli diablos fitted, and on the dryish but cold ride back to. Norwich was able too have a bit of fun, but in truth I had more on the triumph the last few days especially green leaning lol. The fazer will make far more sense when springs here I guess, but the trumpets a keeper.