Alot of cash.
Engine out
Bigger turbo's
Sports Cats
Manifolds
Downpipes
Boost pipes
Headwork
Cams
ECU upgrade
Fuel lines
Fuel pumps
Water injection
Air filter.
With that you will need
Brakes front and rear
Suspension
Anti roll bars
Bushes

Like anycar really, if you spend the money, you get results. The more you spend, the faster you go!!

You don't have to go too crazy, but with all the other mods on mine......£75k + car !!!!