Yep, you got most of the things right.
Just be sure that you are starting with a good engine, with correct timing and new lambda, MAF and spark plugs(preferably iridium).
That's a good beginning.
And then you can start with the modifications:
1. remove the cat and place a resonator on his place. Example
2. don't go for stupid aftermarket intake boxes. The factory intake is perfect, just search for "v6 intake mod" and do it. Cheap and simple.
3. lightened pulley
4. sport cams (they are really expensive, 800euro+)
5. and finally remap.
This way, if you don't do (4.) you'll get arround 15-20 horses.
If you want more, you'll get sport cams, polish the head, and go for a custom exhaust manifold and lightened flywheel. This way you might get up to 180hp...
And if you want even more, the next step is individual throttle bodies.