Don't worry about it, i've been against one of these before.. I did'nt loose but I could'nt pull away from it either. I just let him overtake me in the end because we hit a patch of fog but I suppose he thinks he won. It was black and had an SRI/GSI look mk1 corsa that was debadged. Astra 2l GSI and GSI turbo conversions are popular with the chavs so it could have been one of those. Obviously it weighs something similar to a baked bean can so you won't have much of a chance, especially in a straight line.