[west86]

Does anyone know the best upgrades to buy for performance on a C280 and possible cost and problems?

 

[solicit]

Have a look at www.performancemercedes.co.uk, performance mods for any merc is not cheap but from memory you should be able to get a turbo kit for around 5000 pounds.

Supercharger might be cheaper? Otherwise just add an exhaust and nos it. Nos kit should not cost more than US$1,000.