That was nice of your dad and surprised that the tires were actually changed! I'm sure the tiptronic could be swapped in but I don't know how involved that swap would be. IMO you'd be better off just swapping the 5sp into the car. You'll find some pretty good ideas of what to do here on the forum but ultimately it is your car so do what makes you happy. Next step is to figure out what you want from the car....better handling (lowering springs/struts, beefier rear sway bars, etc) or more power (best option here is turbo and a)keep the psi moderate and enjoy the little extra or b)build a forged engine to handle the higher psi....standard bolt-ons can be found, ie: intake, header, exhaust but they will not gain you much in the power dept) or keep it somewhat stock and reliable and do little things here and there to make it your own.