well it is rusty if an engine was rusty wouldnt it perform bad
A rusty car/ engine is a sign of how well it is taken care of IRL. Neglected engines loose horsepower from lack of maintence. This includes oil, replacing worn parts and keeping the engine tuned. so yeah rust and horsepower can be associated.
I still find it dumb that the clean one has less mods, it would be nice to have a bad ass off-roader with a clean paint job.
Lol I find it dumb that R* made all the driving un-realistic, didn't add 4wd on numerous 4x4 vehicles, didn't add turning while doing wheelies, didn't add the ability to leave your engine/headlights on, didn't give the ability to NOT wear a helment at all (I could go on but I'll stop)
BUT they added the feature that a rusty car goes slower then its clean counter part...Spot on R*...spot on..