burn some rubber off the line, look in the mirror and look for number eleven - 11
if you only have a number one - 1 then no diff

haha. true that.
also, find some loose gravel on a level surface. straighten the wheels. remove your hand from the steering wheel and punch it. if you pull to the side - no diff. if you stay straight - diff is there.

btw, i used to have my customers do that, when i was explaining how quattro works, back when i was selling audis. was always my favorite part of the demo... the customer was always like, "you want me to do what?" lol
