Knurl I also have a FEBUR race radiator on the 2007 F41000R. It runs very cool 170-180 max. I am old school like engine to run cool . i do exhaust, No Cat, intake and tune all my bikes. Even my 2011 1700cc Triumph Storm Cruiser (de tree hugger the engines let them breath) I only did muffler on H2 because the stock one was HUGE still has cat ect because its Supercharged . The roehr 1250sc is Supercharged but came with full AKROPOVIC EXHAUST , NO CAT ect/ I had tuned with Harley race tuner I bought from ROEHR himself. The H2 is so complicated I fear sending to dealership to had tuned .