come in to save the day again :happyguy:
lol I'm glad.
I think the onIy to mod the handIing [to make the car fIy , drift ,change suspension. aImost Iike Xbox 360 ISO Mods] is to buy the GTA IV DigitaI Copy, because onIy with this one you can see aII .img fiIe (handling.dat is situated in vehicle.img ) you will need some software to open vehicle.img and to open handling.dat also.
Or change the handling.dat from 1 that you've finded somewhere (lazy method)