i have the rusty and comes with plastic shocks and plastic drivetrain like the output yokes the half shafts and plastic on the axles even with the old pro .15 engine you will have alot of problems with them in a few weeks the first thing i would buy for it would be mip cvd kit if you put a new engine the mods that need to be made is usually just cutting a few threads of the crank so the clutch nut can tighten up to the flywheel tight and a good cheap engine to put in it later would be a OS .15 they dont make any steel tranny gears for the rusty i dont know if you can full out rpm your car because i have never looked but i know they make a few things