So im looking at the options for the 07' X5 and see 3 different types of leather seats: Nevada leather (standard on 4.8i), Perforated Nevada leather (it says NC fr 4.8i, 1450$ for 3.0si) & Napa leather (option for both models).

What are the major differences??

This is what my X3 looks like, can someone tell me what is it exacly