Thing ive always noticed with turbod cars is that the performance advantage they have above 60mph is much better when you start alongside one at 60mph and then both boot as opposed to hitting 60mph through the gears from a standing start
Cant speak about the FRS but ive had a couple of blasts against what I think was a standard LCR, Once through the gears and difference above 60 was hardly noticeable until I conceded approaching silly speed, whereas booting from a cruising 60 in 4th I was beaten easy, booting from 60 in 3rd he pulled away initially but then difference less noticeable
Id never take on a turbod car unless it was from low speeds through gears, starting in 4th your gonna get hammered, 3rd maybe not as much, its the 2nd gear in RSs thats the best IMO