[cdog]

The key is to somehow not be able to hear to the exhaust/wind but yet to hear music. The only thing I can think of is the plug-phones.

Constant wind and exhaust noise is not good for hearing. I think it is against the law to wear earplugs, but the little foam ones really don't eliminate noise, just lessen it, so conversation, horns, etc. are still audible. Your hearing is saved though.

As to loud stereos, there wouldn't be anything cooler than having my 'glass trunk lid vibrating loudly from the massive "woooov wooov" of a Sir Mix a Lot CD through four 18" subs, but somehow I think that without side windows to limo tint out, and without a rear window in which to put foot-high lettering saying "El Snako Loco" in a thick, old english script, what's really the point? Maybe if I get a GT40....