The car comes as a Ready To Run kit fully assembled and complete with radio, fuel and starter so it's real easy to run.
Stick some batteries in the radio, fill it with fuel and away u go.
The nearest thing to a stage 4 turbo for it is a 2 speed gearbox. Its a bolt on extra which takes its top speed up to 60mph or 600mph scale speed.
I had it fitted with a set of black wheels but my son had a slight argument with a steel fence while driving it and the fence won smashing a wheel in half so its back to the gold ones for the time being :-)