In a normally aspirated car, gains can be had with IM and EM port and
polishing, cat-back exhausts, different profile camshafts, adding a
supercharger. "Chip Tuning", per se, will not gain so much in the way that
it does for a turbocharged engine. Not to be a "mod-cop", but there are
warranty issues to consider with most performance upgrades in a new car -
weigh the potential costs with the benefits before commiting your wallet.
Check out the A4 forum on Audiworld, or get a copy of Audi Driver to see
what there is out there.
1987 Audi 5kTQ - qlcc chip/charlie spring installed (+60? hp), sport
interior and "Audifans" sticker add an extra 5 horsepower - no dyno to back
that up, though.
1980 Audi 5k - had a K&N...that's now protecting my shelf from dust.
1962 and '64 Auto Union DKW Junior deLuxes - 34 whopping, (bias ply) tire
smoking (mostly hidden by exhaust) horsepower 2-strokes
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