Figures for stock kits are both wrong.
Mr. Turbo could get you about 220hp
Hahn will get you 24-26hp stock kit.
307hp on a hahn is a lot more work, you cna get that kind of Hp from both kits with about 2 rides.
You need to ask yourself what you want to do. Race, street, drag, 9/10's. read lots of poist and info on the boards.
If you really want to HP you cn pay more for a MC express etc.
My Hahn has lots of expensive mods and is not a kit anymore.