I still have my doubts about that test anyway. On the ford 2.3's, a log is worth about 20hp, a header worth about 30. Since I'm building my own, I'll forgo the 10 hp to have a much easier build. The 2.3's tend to run much higher boost than say a Honda, many run over 20psi every day (I run 23 on pump gas), I would think a more efficient header would show itself here, but it really hasn't.

I'm not saying a full header doesn't make more power, I'm questioning how much more power it makes, and at what expense (whether buying or building, or keeping it from cracking).