Well tomarrow i Pic up my new 06 Yz450f I am upgrading from my 05 yz250 smoker...is there anything that i should do to the bike?? for mods wize? i have heard about doing something to the the chain slider??? anything else that i should know? This is my first thumper soo its a new thing for me but iam looking forward to the new big bike. Andy how is the stock pipe i ride a bit of everything but i am going to start Hare Scableing soon soo just a thought....thanks guys i am glad to be a apart of the Yamie Thumer club!!