These cars were “chipped” for the American market. The computer chip can easily be upgraded by “A.P.R.” REALIZE that these engines do NOT work their best without synthetic oil that meets specification 502/505. This means Mobil One 0W-40, and Total Oil (from France) 5W-40. THere are a few others, like Pentosynthe and Lubro-Moly. Engines have wrist pin squirters in them to aid in internal cooling and extended engine life. Regular oil will destory it!! Make sure your crankcase ventilation system is not compromised with sludge. Install a set of Denso Iridium or Twin Tip spark plugs. but ONLY after you are sure the engine is clean inside and vant system is AOK! POwer wash engine to dissipate heat evenly. Use “top tier” fuels, only. READ about this on internet. Use only Audi fluids, NO NAPA PARTS EVER!! THere is a higher output KKK turbo available for this car. E-mail “A.P.R.” Audi performance specialists for more information!
You could use a “performance chip”. it helps with power, acceleration, and improves gas mileage. However, you could change fluids to a higher grade, and update the cars computer. Good luck with your SEXY car. I hope this helps 
A performance chip will help, stay away from “IAT” chips as they aren’t really chips. Check out voloperformance.com . Also just making sure you have clean air filter, and doing regular tune ups will help out.
cold air intake does help