A renamed bf1_ texture file... It looks dire, very dire. There's nothing wrong with a 'sauber' LX car - but it does want a custom skin and not just the BF_ skin renamed to work on the LX, that car looks dreadful.
switch the names of the .vob files.
it is NOT recommend to do that, and it will NOT improve the handling of any car, in fact for alot combinations it can cause problems.