Tried the search function but couldn't find a discussion about the OBX vs. the Ebay headers. The OBX new is $3-400 and the Ebay is $65. Huge price difference. I would like to know if someone has done the Ebay header and has dyno numbers. I very much want to upgrade my exhaust. Mine is a 99 2.2 M5 bone stock. Looking to do the quad 4 throttle body and CAI as well.