+1 on eBay. But if I had to do it again I wouldn't have put a header on it. At least not an obx. Mine didn't fit right and had to do a lot of grinding so it would not hit the oil pan and the stainless is way too thin. Also I didn't like the loss of torque down low. I just though it was more a pain than with. It does look nice (for a month or two and is a lot lighter than stock) but My sri aem gave me the most gains.
Also forgot to mention I throw a cel randomly and some times when it rains due to water getting on the o2 censor causing low temp. Oh yeah and it makes the car harder to start. Okay sorry im done just years of built up frustration.
I must have gotten a bad one then but I had to shave off 3/4 in off the flange to clear the oil pan. It's a nice cheap upgrade but to me I wouldn't do it again if I had the chance. Would have gotten ud pulleys or something else performance wise.