Burns Stainless Technology

An in-depth discussion of Exhaust Header Theory

Detailed Header Construction insights and tips

A 5-part series on Header Construction and welding;
Part 1 , Part 2 , Part 3 , Part 4 , Part 5

Stainless Steels for exhaust systems

Aluminum Alloys for Racing Applications

Inconel for Race Header Applications

Everything you need to know about Turbo Headers

Art and Science by Ian Bamsey featured in Race Engine Technology

Here's a very professional article by Gustave Stroes detailing his installation of a Burns Stainless Y-pipe on his BMW E30 M3.  Lots of great pictures.

For one of the best studies you’ll ever see on tuned exhaust system phenomena, with extremely informative gas pressure graphs from measurements on a Lycoming 4 cylinder engine, check out: Aircraft Exhaust Systems IV, EPG, The EPG and Aircraft Exhuast systems by Brien A. Seeley and Ed Vetter (http://cafefoundation.org/v2/research_reports.php)