The svt header has been proven to be the best header. Many people run the obx., I think the quality of material ( the SS grade) is lower on the OBX.
2001 ZX3 2.0L Zetec-
Hatch Nation #42
Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)