the 2009 A4 vs 2008 (s-line)
Engine:
2009- +20hp due to improved Variable Valve Timing and diverter valve.
2008- diverter valve prone to failure after tuning.
Driveline:
2009 - Dynamic drive select (option). Makes for on the fly switching, sporty, fun, works
2008 - youll end up buying adjustable coilovers anyway.
Both have quattro or front trak
Aesthetics:
2009 - redesigned... questionable aesthetic appeal, but very nice led lights.
2008 - S-line appearence generally accepted as a great blend of aggressive class.
Tunability
2009 - new, not too many products out yet and you will pay a premium.
2008 - fairly large and growing community, lots of products, good support base. Lots of options.
In conclusion: I would get a relatively inexpensive 2008 S-line as a platform, then start modding. Youll have a unique fun ride and wont have to spend as much to achieve a tuned ride as you would with a 2009. B-7 platform is where i would put my money... and I did.
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