You are right, they are 10-12K usd, but if i should have something that will hold up against 800 hp + / app 800 lbs-ft, i would need the "tranzilla" T56.
That is somewhere in the ballpark of 7K usd. I am spending a lot on the rest of the car, so 3-4k does´nt make that much of a difference in the end
Would just be cool with a sequential box!!!