Re: Chevy 366 hop up
hoser, i agree with every thing you said. as i said, most exhaust systems are not tuned correctly. if headers are built/tuned per the 2000 rpm area above the torque curve of a particular engine, there will be significant gains in efficiency. problem is, you cant get those from a magazine. no need to offer proof, as proof can be skewed. most manufactors show incomplete data on their dyno sheets, or alter the run conditions for favor in their direction of advertising.