Hi, Thinking of cam upgrade, i'm looking in the direction of Andrews 21N cams. I have a stage 1 already (K&N rk-3909, PowerCommander 3, kerker mufflers) - Did you installed the 21N ? - How did it change your bike behavior ? - If you had a PowerCommander, did you need to retune it ? - If you went to the dynojet center again, did it need to adjust the settings a lot or just a few ? Thanks for your feedback.