Motorsport rear wing vs. Regular Exige wing

What difference between the two in the real world ?.

I prefer the shape of the OEM but with 250 + bhp is the MS wing a must ?

Discuss.

Nothing is a must. The motorsport wing does work much better than the standard wing however, provided it’s mounted solidly enough. You’re only likely to notice on track, and even then only if you’re really trying hard.