I hear you, I definitely know where you are going with this. But as Tdot stated, NA is better for road courses. I've seen way too many Turbo guys over the last 16 years of going to the track 30+times a year on the side of the track or ending their sessions early or days early because of "issues". For road course reconsider and go N/A.
BMW 325I E30 Chumpcar Race Car
BMW 540iT M-Sport (New Family Hauler)
BMW 428i Maranello BMW company car