Does anyone have experience running Keihin 41mm flatslides on the ZX11? I've read that they are worth a significant power gain. I'm wondering how true this is. Right now my stock carbs have aftermarket jets and needles and are tuned pretty much perfect. I don't want to start a nightmare of tuning if its not going to be worth a reasonable HP gain. I also don't want to sacrifice any drivability / reliability. Right now my ZX is a turnkey machine. Starts right up every time, no stumbles or problems or issues of any kind. Any info on these carbs will be greatly appreciated.