Forum:Car modifying & car's behavior on the road

Hi 2 everybody. Does anyone know whether such car modifiers as wheels, exhaust, roofs, spoilers etc. have any affect on vehicle's performance (or, more broadly, on car's behavior on the road)? gta san andreasit seeems to me that zr-350 with off-road wheel and spoiler is faster and has better handling than zr-350 without spoiler and with original wheels. or it's an illusion?