Quote Originally Posted by Irelands child
Dave S,
From what I have read, step headers will, in some cases be worth a few Hp - but not necessarily in a street driven car/engine. Stahl is not a big fan of them and this guy, the second listed, not sure of his credits, also does't feel that a step header is a real benefit - see #5. It makes sense to me.

I went to college with Jere Stahl - and he was developing interesting stuff w-a-a-a-y back then and was the class car geek.

You mean they really had colleges way back then Dave????

http://www.stahlheaders.com/JpgFiles/issue3.pdf

http://www.x-pipe.com/Scavenge.html

Methinks(I know - archaic, but I'm an OF) that step headers need to be developed with a certain airflow - camshaft and head design and an RPM range that the engine will turn most of the time and that just welding up a set of pipes at arbitrary lengths without airflow/dyno tests wont do it and that Hp might suffer

If you do build them, please make sure that you keep the forum updated as I hope you can prove these guys wrong .
Some very interesting reading on Stahl's site, seems the other guy was just pedaling some new gimmick... Guess I'll go with Stahl's suggestions, he sure does seem to know his way around an engine, especially the exhaust side of it!!! The items on velocity are certainly true, can't argue with basic science!!!!! Gentle bends (didn't that used to be a TV show) and properly sized tubes and collector's still seem to be the best answer to cleaning out the exhaust. Maybe I was just hoping for a magic bullet!!!!!!!