Expert Builder Series #8860 Car Chassis with big wheels and Rack and pinon steering, two-speed transmission, working cranckshaft ans pistons, Independent rear suspension, differential gears, adjustable reclining seats.
If it's a challange you want, it's a challenge you'll get with the Lego (r) Expert Builder Auto Chassis. You build it from the ground up and you build the working parts right in.
It has gears, pistons and universal joints that really move. Add an Expert Builder Pack and it revs to life.