Hi there guys i own a 2003 harley with stock block and stock heads, well all of the internals are stock including eaton blower. So far i have simple bolt ons like full exaust with headers, full intake,boost bypass, heat exchanger, and since its a harley i installed the lightning upper pulley. Im about to purchase a *** cog belt system but im not sure which ratio is safe for me i would like the 6lb lower and 2.7 upper which is the best kit i believe for higher boost if im not mistaken. I know that tunning is very important already purchased a diablo predator and have a really good tunner down here in miami. Well if u guys can help me i would appreciate it.Thanks