stacks... are bad-ass
Until some a-hole in front of you on the highway decides to do this.......and you get a helmet full of diesel exhaust.
i hope theres not many pedal cyclists here,when a bunch of cyclists hogged the road and i was at work driving the old cummins,once i got past ide select a too tall gear and bury the pedal,resulting in a great thick black particle laden smog cloud ,oops.