You do not need a converter to run 10's. A good tune and tire and you should have no problems. Also VMP is pretty popular with tuning the Roush blowers. They even have their own version.
2011 GT Premium 401A Grabber Blue Automatic
Boss Intake, Circle D 4C Converter, American Racing
1 7/8 Longtubes/off road x-pipe, Kooks Catback, BMR lowering springs, Strange 10 way adjustable shocks/struts, BMR lower control arms, BMR upper control arm and mount, BMR control arm relocation brackets, BMR adjustable, panhard bar, Weld RT-S wheels, Hoosier fronts, M/T rears