My suggestion would be a full 3in turbo back exhaust + Verso tune and maybe a better replacement panel air filter.....this alone will net a very noticeable gain through the whole rev range especially lo-mid range torque....and more importantly it should net you much better fuel economy.

My XT had quite a few more mods and was making about 100kw over the standard engine power....best part was that my fuel economy around town was always around 10.5L/100km.....country driving used to get me around 8.5L/100km which is way better than the standard figures.