Hello..I'am going to be doing a free flow system for my 02' Boxster 2.7. And Iam looking for a good set of headers to complete the package,I have 987 air box,74 mm T.B, and the Plenum,plus 200 cell mid pipes,I will need the 02 sensor bung's,( maybe use those mini cat's ),.I do have emissions testing ( Tucson,az ) But I will be using the stud's so it will be easy to switch the header's out for the stock system,.. Thank's ! Frank