Pulley and tune?
#2
They all advertise around 50hp crank for each of those mods. Realistically I believe it is about 30hp at the wheel, meaning 35-40 MAX at crank. Majority go with 172mm, you can go bigger but only with a lot more mods to go with it. Hope this helps, as I am putting my on dyno tomorrow and ordering parts from Eurocharged next week.