You need a miracle. =P
But serious, if you want to increase the power, the best way will be install a bolt on supercharger or turbocharger kit, like this one.
http://www.sfxperformance.com/parts/PDNK10521201.htm
It isn't cheap, but at least you will get a serious power increase with this kind of kit, you will get around 50% power increase without need to rebuild the whole engine.
If you need to tow things, the best option would be the supercharger.