Did I just discover a newTrackmania bug? 

Ty for your feedback didn't know about that. But i just tested and I'm getting this on the validated map!

That drift sound i a indication that you did The first part of The bug The right way. So you do this weird drift thing and than you drive to The other gate and do The same inputs again to Get The carswitch uber:)

i remember getting the same dift sound and i could see the skid marks even though i was driving straight when i was playing wirtuals fishing town map. i reversed and pf at the gate causing me to have skid marks whith the stadium when entering the gate, causing me to have the skid marks always when driving with the snow car