I was looking on their website and it says you need their needle. Can I run the stock one or do I need theirs? Also what main jet should I run with a full Sparks exhaust and K&N filter? I also want to run the airbox lid but will probally cut it. thanks

That's not true i have the HRC needle 180 main 50 pilot 2 turns out on screw and it runs like an animal. What year do you have? I have an 05 with the rear portion of the airbox lid cut and an outerwears airbox cover over the lid and my jetting is spot on.