I have a beautiful Diamond candy red 2009 C14 bought in April. Last week, I upgraded to a high flow K&N air filter. I definitely feel an improved throttle response. Some unexpected mad money came in at the end of the week and so just ordered a Delkevic slip on. I can’t wait to bolt it up and see how she runs. Next step will be flashing the ECU. This bike already runs great and is super comfortable. The next steps might just blow my mind.