Don`t mean to sound like an arse ( European a$$ ) but the people telling him to upgrade his car if he is losing it are nuts ;-)
If he can`t handle a stock RS without spinning it the first thing that should be upgraded is the nut that holds the wheel.
Upping the performance of the car just means next time he loses it he will be travelling at a substantially higher speed. This will result in a mangled car and possibly an injured or worse I-clubber.
Neither of which are cool.
Racing lessons will result in a more aware and in control driver who can enjoy the limits of his car in safety. Once you can throw the car around in complete safety as it it`s part of you - then think of upgrades.
In all seriousness the most important performance part of the car is the driver. To finish first you must first finish