I bought my DC Sports header used recently off eBay for $177, the ceramic model not stainless or chrome or whatever. It preforms like a champ and I can say I can tell a difference, esp at low end. This is the last of the bolt ons I've preformed to my 98 EX (helix, aem cai, dc header) and I can say without a doubt it's been the one that's proven more powerful. However, it could just be the in-conjunction-with factor of the other parts. I haven't been on a dyno so I don't know. I'd say that $400 (MSRP, I found it for about $350 online brand new) would be a little much to pay, but if you can get it used -- why not?