I got the Premium sound b/c i didn't want to mess with aftermarket stuff for the entertainment part of my car. Sounds pretty good to me and others have been impressed. I don't know how stock sounds but it can't be bad. At least i hope not for the price you paying for the car.
08 E92 AW M3 | HRE P40 19" | APE Air Filter | BMW Performance Grills | White Side Gills | CF Mirror Covers | BMW Performance Pedals | F1 Pinnacle Tint | V1 Hardwire | Dinan Performance Software | Gintani Exhaust | H&R Sports Springs | RPI Scoops | BMW CF Spoiler | Challenge Diffuser | Lux H8 V3 | LCI Tail Lights |