i think leave it stock, and also tint is useless.
what i would love to see is OEM 19" M3 rims.. the wide ones in the rear. which would make you pull your fenders. i dunno, try fitting them in? with stretched tires, it could work.
2000 Audi A8 SWB Silver/Black
1992 BMW 525iT/5 White/Blue [MPars, HIDs, cargo net]
1989 525i [scrapped]
1995 BMW 318i DASC [sold]