Lots of ways to accomplish oversteer, but it depends on what conditions you want it in.
Lower front spring rate/raise rear spring rate
Lower front sway bar stiffness (or remove it all together) and/or stiffen rear sway stiffness
Front toe in, rear toe out on the alignment
Lower front/higher rear tire pressure will help a little where changing suspension isn't practical (I ran 38psi front 42psi rear in my STi. It still understeered like you wouldn't believe unless you trail braked and really caused some weight transfer, but the tire pressure helped a tiny bit).
Just a few ways... plastic trays not included on this one. Thats a FWD trick.