First off, that is a WAY nicer car than I had at 16.....so you're already doing pretty well. At 16, I bought my third car, which was a honda civic hatchback (the super slow trim with dual point injected 1.5L and 4 speed trans) which was 12 years old at the time. No power ANYTHING, even had manual steering (not that I mind that on a small car). So first, enjoy the fact that you have a good-looking, sporty, relatively fast car at 16. At this point, I would work on getting your feet wet doing maintenance on the car, work on keeping it in good working order, learn how to change your oil, cam-follower (if it is FSI), spark plugs/coil packs, air filter, etc.
Second step, start saving your money. If you have a job, great. If you don't have a job, get one. It will teach you responsibility and give you some money in your pocket. Once you have saved your money, you can buy your car from your dad. Then you can do whatever you want to it. You will appreciate the car MUCH more when you own it yourself, pay the insurance, pay for your own gas, repairs, etc. It sounds stupid, but it's true. It will also show your dad that you're responsible and ready for a modded car.