/6 headers

Could be wrong but i see no scavenging effect and pulse reversion on these. I do not think personnally there would be any power gain. Probably a loss.Primary lenghth and collector size contribute significantly to the power band.These look like a dump exhaust and would kill low end although they may show power gains on the top end.Theres a lot of science involved in a good set of headers. The pit stop section of the September 2007 issue of Hot Rod magazine covers this in detail.