Undertray part name/number
 

Can anyone name me this part? Searched for various combinations of undertray but can't find it.

http://dl.dropbox.com/u/31070602/undertray.jpg

try to look for it here:
Porsche Boxster Bumper Front Parts

you should also be able to find the part number on the part itself.

It doesn't seem to be there but I could check the good side for a part number, good idea.

Please post the part number for the good side if you find one. That's the side I need...;)

Looks like that's part of the wheel housing liner.

Wheel House Lining parts

Auto Atlanta has a great site. I think the part you need is 996 504 203 06. It is called the wheel housing liner. I don't think the triangle piece that you circled is available separately. It is listed on the drawing 'Porsche Boxster Liners'. $183.52 for a 10 cent piece of plastic. Too bad I need one too....:(

Yes it's the front end of the wheel arch liner, it's not a seperate part.

There are two other parts in the circled area. It's hard to see if they are present on your vehicle. One is number 4 in the diagram - the rubber lip. The other isn't shown, but it's number 10 on the list - the air duct. These get damaged from front end scrapes.