They are fairly tuned as standard so getting more power is difficult. First off your looking at a chip, BMC induction kit, Exaust and De-cat should see you to 140Bhp. upto 150 maybe you'll probably need all that plus cams, headwork, and exaust manafolds, and a custom remap. After that your into the price bracket for turbo conversions, and then onto whole engine conversions.
Then by the time you've done that it costs so much you may aswell spend the money on a faster car to start with
Im guess bhp figures here so dont quote me on them
