Use te search button

Go on people build threads and have a look what try have done
Forget about stage 1 and stage 2, just do your mods and get a custom map

*rough guide*
Forge 007p
Good Exhaust .....milltek
Smooth airbox with panel filter
Fmic
Tip
Silicone hoses
But possibilities are endless depending on what you want
Could get w&m injection
Bigger injectors
Fuel pump etc
Although they won't give you much gain with a k03s