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Originally Posted by Adam
Are there any header systems for the boxster S that have pre-drilled holes for the O2 bungs?
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There are, you can try Fabspeed motorsports or Dansk headers. But you won't see any HP improvements. The forum has had a number of Members (Private Message CARMOS) that really have not had any luck with them. I know Carmos has some threads so do a search on "headers" and his posts will come up.
With the O2 bung locations it is CRITICAL to have the bung located within 1/4 inch of the OEM location. Otherwise you risk burning up your converters and getting the wonderful CEL.
Should the header not have a bung already, take it into your local muffler shop where they can drill and install the bung and thread in your O2 sensor, no problem and be sure there are no holes or leaks which can cause problems too.
To locate a muffler shop in your area click on this link:
http://www.magnaflow.com/03dealer.asp
Hope this info helped.
KRZZ