buy a sports bike and a shit box car.
pref a shitbox ute...for trackday transport as mentioned above.
Unless the car is a couple of grands worth its all DEPRECIATION waiting to happen. As for modding a car, more wasted money. You'll never be satisfied. Some other wanker will always be faster cos they have more money to waste than you.
At least on a sportsbike they are all rockets and the deciding factor is just how much of the bikes potential your brave/silly enuff to explore.
The first stock 600cc sportsbike you ride will blow ANYTHING you've driven away. Then there are the litre class bikes, when acceleration is limited only by your ability to keep the front wheel on the ground while you try to get it to the throttle stop in the first 3 gears...difficult.
Just be sure you don't get yourself killed.
Aaaaahh... you just gotta love the insanity of it all.
Realise your most cherished desires by defending them from your casual wishes.-George S Clason