You may be right about the anti-glare coating, VAG tend to put weird coatings on just about anything.
I would imagine the best place to start would be a remap, probably the cheapest as well, but would recommend somewhere that has Dyno facilities that can accurately measure the increases and tune the car accordingly.
Can't imagine there would be much improvement over the standard OE components (intake/exhaust) on the R8, or if there is it wouldn't be cheap