Well Roush almost never goes and modifies the top tier performance vehicle(only what 6 Roush Terminators were made) most of their cars are modified GT's(for the Mustang) so I see them doing their classic 3 stages. Stage 1 being a regular Focus with a body kit(and wheels), CAI, Exhaust, and a slight tune. Stage 2 would be all of Stage 1 plus a full suspension. Stage 3 being the Stage 2 with that supercharger. This would have it tiered just how the Roush Mustangs are and none of them reaching the top tier Mustang level powerwise so I don't see them trying to compete with the ST powerwise, atleast not getting really close to the same power level.