Can you be a little clearer regarding the bleed valve ? are you referring to the braking system Ryan m,
And it all depends on which stilo you have [engine size]and the amount of money you are prepared to spend

general things like a good quality exhaust system/GSR induction kit will give you an increase in BHP and the guys in Greece fit turbos on their stilos which will set you back a few thousand Euros so there are possibilities as I said its down to money

Oh and of course with the JTD and 2.4 engined Abath a remap is the first port of call.