have you done anything to it yet?
if not then there are few fairly cheap mods you can do get a few more ponnies out of your.
- panel filter or induction kit (which ever you prefer)
- S/S cat back exhaust
- remove pre-cat
- sports cat
- Superchip/remap
those mods should see you around the 165bhp mark
after those mods things start to get expensive like cams, head work etc.
moved post to the correct area for you.