Hi, I am looking for recommendations for an exhaust upgrade for my 2006 Boxster s recommendations?

Apologies for the spelling, Exhaust upgrade.......

 

I can get you the Agency Power side mufflers for a good deal

 

Since you are in Europe, I would recommend contacting Gert @ http://www.carnewal.com.
He can do some tricks with your existing components and save you a lot of money.

 

Ditto on the Carnewal option looks completely stock and also get yourself a "Y" or "TT" exhaust tips for a little gurgling at startup, additional aggressive tone and nice look. Carnewal has one and plenty out on the web for less.