I think the ebay header is the HP racing header. It has been talked about for a long time, and they keep promising dyno numbers. But I have never seen those numbers anywhere. The only time I have ever seen S&S headers ever mentioned was for the SCC Header comparison. Before then and since then, I have never seen them for sale or heard of anybody who had them. Tommy 93 Sentra XE w/JDM SR20DE 92 NX2K