produce a competition header for easier installation and a lower price the comp header will ... header we will sometimes spend two to three times more just to make a super ... competition header work only five to ten percent better yes,hooker ... and smaller diameter primary tubes to enhance low to mid-range performance ... generally is not better when it comes to street driven cars when you put too ... you usually notice a severe drop in low to mid-range performance due to a lack of ... backpressure to combat this issue hooker sometimes ... sizes diesel exhaust systems mufflers how thick are your flanges and are thicker ... flanges better not necessarily the key to a good flange is to seal at the exhaust ... are machined using a milling process to a surface flatness of or .0025 ...