I think coilover did a great job of making sense of it all.

I'm putting a small block TPI in my 'burb, so I have been looking for headers. My favorite maker, which I have used before, is Sanderson Headers. Their web site has some good tech info, basically the same stuff coilover was talking about.

http://www.sandersonheaders.com/tech_get_technical.php

Also, some neat stuff there regarding changing pipe sizes midstream ( creates turbulance and backpressure.)

http://www.sandersonheaders.com/tech_complete_performance_exhaust.php

Mark

1951 Chevy Suburban
In the Stovebolt Gallery
Lots and LOTS of pictures
Project Journal --- 10 pages worth!