This is gta iv wheelie mod. most stable mod see the video

http://www.youtube.com/watch?v=qFWj2JMhgsw

it works best on comet.

here is the commet line.
COMET 100000000 40 85 0.0 -0.39 -0.35 0.0 5 0.70 1.0 750 0.90 0.66 0.7 21 7.0 5.2 5.5 0.12 0.25 2.4 1.6 1.8 0.10 -0.15 0.0 0.5 0.3 1.0 0.2 0.2 0.0 60000 40440010 1 1