The downtime for a swap is what would kill me as this is my DD. I like this option for the easy return to stock/swap to another xfire down the line. If the NA is ~170hp at the wheels stock I would be happy with anything around 270whp range with the turbo. Turns the NA stock rivals (350z, rx8) into easy kills and moves up to stock sti/evo whp numbers. Don't know if that would also mean kills vs those (prob not on a twisty track) but there shouldn't be much rice left over that will make you look bad.