I don't think you'll make any massive gains, but you will improve throttle response with a modified airbox and decent filter, just make sure it's getting cold air, not hot. Then, go for decent ignition, leads, plugs etc... Then look at the exhaust, that'll help...
Taking the revs to 6.5k is about all you'll get, (rotor arm change), this'll probably make no extra power without a cam change though.
Decent oil, decent oil adative (slick 50 etc), clean injectors.
Run 75/25 Super to standard Unleaded, octane booster (max dose) fuel injector cleaner (minimum dose)...
Think good air, strong fuel, bright spark....
Oh... And sling as much weight out as possible....
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1985 WR quattro, 1985 20vT RallyRep, 1993 MTM ABY S2 Avant. 2010 S3 Sportback.
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