Don't take
@luigisho advice as a deterent, these cars are fun, but problematic when it comes to the cost of maintenance and all the work. If you are a diy person, great that will save ya some money. Many of us including me have a daily driver.
The best bang for the buck after an all around maintenance of ALL fluids, Tran, PTU, RDU, flush and fill radiator, flush and fill brake fluid, get a K&N drop in filter, 3bar MAP, replace plugs with colder range, get a tune from gearhead or a fan favorite here AJP.
That's it..... a tune will give your car performance and gas savings.
BTW the map sensor, requires a tune.
If you do it any other way you will come back to my advice in the end.