hey, before you waste your money, Starter motors are not capable of sustained use. The duty cycle on them sucks! More like 10% If you crank for 15-20 seconds you have to wait 1-2 minutes to cool it down. Remember, that is even with a cold start condition with it being bolted to a giant heat sink (the engine)!
You'd be better off using an exhaust driven turbine to be honest. The cost will end up less once you have paid for a motor that can sustain the boost-on-demand as well as the electrical system and cabling upgrades.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black