I have seen these seats in person, they arnt all that they are cracked up to be. and for R50k, you can get Recaro sports seats with your name embroidered onto it. A waste of money if you ask me, rather take that R50k and get the BMW performance intake and maybe a chip, so you get more juice.
Racing seats dont make the car go faster. Thats why F1 cars have racing seats, coz the car is blits fast, and the engine is a beast, not coz the seats make the car faster, lighter (arguably), but not faster.