Dude, Joe, seriously, go back and re-read. We're all friends and man I hate to point it out but I bet they said they flow nearly as well but not better. I'd like to read that and vaugly remember that HPP article. Unless they we're comparring some crappy 3 tube headers or similar there is no way. The full length headers simply have longer primaries and offer more exhaust scavenging. When does that help depends on hp level and cam overlap.