I got one of those Maricopa county smoking car letters too. It was in the 96 cummins. I had a tailgater following me up an on-ramp in tempe so I went to 4th, stayed on the fuel and i really shoulda been in 3rd.. i then dropped back to 2nd, stayed on the throttle and went through 3rd and 4th, leaving a BIG trail of smoke. About a week later I got the letter.
-Luke