20 HP and 24 lbs torque with fuel,air,timing possible?

[Jamesp]

Originally Posted by KRAM36

It takes the right combination of parts to get more power out of these engines. On a 2003 Boxster S with a Tiptronic trans I believe 313 HP can be obtained with no internal mods to the engine itself, a manual a little more if you're willing to go catless. Not cheap to get there, but it can be done.

So what is the list of mods? I have an 03.