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Aside from tuning the car to increase it's power, what's the best kind of regular tuning to have done on a standard S4 (2000). I don't want to increase it's power (yet) but I do want to make sure that I'm getting the most out of the car. Is it a once a year thing that you would get done when you service the car?
Thanks.

Change the plugs, check the MAF (and clean it), replace the fuel filter, check both of your bypass valves and check for boost leaks.

+ Oil and filter change at 5K.