Yes, you can get a few hp out of the engine but especially more torque and drivability .... but i don't want to start something as the possibilities are endless concerning engine and chassis tuning ... my wallet isn't endless :-( .
Check out K-tec racing in the UK ... i could easily spend 20+ K on my Clio.
I haven't tried the A AMG yet, i did try the A250 2 liter sport with 211 hp. Nice engine but i didn't like the dynamics at all. The AMG is a whole different story .. i once had that 380 hp monster up my are ... it did(t take long for him to dust my dieselbeemer