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Just purchased a brand new 2011 R1 last month and first mod was Leo Vince exhaust with Y pipe cat delete and sounds amazing but left a flat spot in the power band. I know some sort of tune/air fuel correction will be needed. After much research I decided to order the flash-tune interface to flash my own ecu and wow what a difference. The hicup at 4000-4500 rpm is gone and runs butter smooth now. I was also able to have the fan kick on at 205 degrees to help me when stuck in traffic. It removed the gear throttle restrictions and just feels like a whole new bike! The best part is that I dont have to mess around installing a power commander and flash a dynojet map right onto the ecu and lowered the engine braking which resulted in much smoother on-off throttle on higher speed cornering. Two Thumbs up for me!
If anyone wants to re-flash their ecu for 09+ R1 in the boston area let me know.