what is the difference in nappa leather & perforated nevada leather

the durability and cost as well as the "grade"

Nappa Leather is more exclusive and is smooth.The perforated option is only available in 2007 onwards on the new model when you opt for the seat heating or active ventilation package the perforation are little holes in the leather to let out air.

look at the name buddy lol nappa is in Italy so its probably Italian leather which is the highest quality leather you can get and Nevada is leather is probably far below that because Nevada is probably one of the worst states

Unless it is the Nappa Valley in which case it is Calfornia Leather :) What do they call Nevada Leather in Germany? Prussian Leather? Bavarian Leather?

Only BMW has the answer to that question and they are MUM! Quiet means........???????