You need to decide whether to use this opportunity to improve and go aftermarket (you can do it for not a ton of $ - see my friend and fellow Z3-er MiguelACA's threads on his recent install of a new 8" sub instead of the garbage 3" one that is stock. You can also go custom and spend more like I did and it sounds amazing - your choice. I'd at least improve with a set up like Miggs did -i minimum! You should enjoy your beautiful car! You can check my vbGarage page on Werkz for details of my system if interested too.
Sorry, I'm an East coaster so can't help you on teh leather.
Good luck!
