I'm going to assume that he got the wing purely for style, not down-force.NOTE: You can leave the wing in place and just go into the settings to return the downforce values to zero.
Unless, of course, you never turned them up...?
Oh and if you want to be succesful in GT4 you'll probably have to give up NFS. GT4 isn't anything like that. You cant just smash the gas 24/7 and expect to win every race.
I hate the wing styles in gt4. I tune my cars to be partially lower in the front end to act as a downforce of sorts. Seems to work. Only certain cars seem to look perfect with the wings, but most of them look like ricers with them on.