im really lookin hard at parts to upgrade my car.....ive been lookin at boost controllers and chips and whatnot but im not sure what would be best

so basically i just want to know whats the best thing i can do for the least amount of money that will give me the most power and still keep my engine reliable?

and what stock parts i'd have to replace...like a wastegate or somthing

btw i've got a 1999 A4 1.8T tiptronic quarto

thought u'd need to know that

 

Do a search for diverter valves and ECUs like APR.