I installed a subwoofer, amplifier, and several good speakers in my car and dubstep is pretty fun to listen to through that. Driving a hatchback has its advantages, good gas mileage and not vibration from the bass making my car sound stupid.
Anyway, for Dubstep I usually just listen to the few Shambhala mixes from Excision. 2010 one being my favourite.
Edit: I got into dubstep about 2 years ago and have since lost most of my interest in it though. Excision, Datsik and Rusko were what I mostly listened to, as well as "Techstep" style songs. I don't like how metal and dubstep have so many names to describe the sounds though...
heavy metal, black metal, death metal, symphonic metal, folk metal, epic metal, technical death metal, progressive death metal, symphonic black metal, progressive black metal, minimalist black metal, that's just to name a few off the top of my head. Dubstep seems to be moving in that direction already.