^^ What he said
I put 4 x 10" rims with 275/35 tires on in the back, and use a bungee cord hooked to the headrest and through the wheels to hold them steady.
You can impress the trailer trash (
) with how much you track day stuff you can fit in an M3... makes for a good comeback when you get toasted by a Porsche Turbo:
"So what! I can fit 20 bags of mulch in my car!" Just look at the expression of envy on the guy's face!