Do not buy OBX headers. Mine cracked apart at the welds in under 5 months and 2 track days. I got no refund or service from the vendor or OBX. I ended up buying a used set of Georges headers. Same engine and they have lasted for 2 years with no issues. OBX products may work on other makes, but on 911's they fail miserably...
http://forums.pelicanparts.com/porsche-911-technical-forum/509747-obx-headers-cracked-apart.html
Live and learn... from my mistakes 
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 Michael
'82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah
'13 Cayenne GTS
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