There are three ways to bend pipe. The first is to use a "ram bender" where pipe/tubing is bent by a jack… More
Summary: While most custom exhaust is unique, pipe-bending charts show classic-model specs, by feet and degrees, to help accurately mold the exhaust; learn how to use the chart on this free auto-repair video.
Doug Jenkins runs Doug Jenkins Custom Hot Rods in St. Louis, where he restores classic cars and creates mild to wild custom street rods. He races a 1972 Corvette in the SCCA...read more
"Hi! I'm Doug. I work with twenty great guys in St. Louis at Doug Jenkins Custom Hot Rods and we're going to do some work for you today on Expert Village. If we were doing a standard exhaust installation we could use one of these cards. And they go by feet and degrees and they describe, for instance, how to build a exhaust system for a '64 to '67 Chevrolet Corvette. Here's the length where you make the bends, there's the degree of how you make them. We very rarely are able to use these cards because we mostly build custom exhaust here but there is the occasion where we're able to use those. Most of the custom exhaust installation is done just by feel. Dave has been doing this for many years but he feels like the way to start the job is with a 45 degree bend so he watches the indicator go to 45 degrees. He then holds it in place to see how well it fits and where his next bend will be."
eHow Article: How to Use Pipe Bending Charts for Installing Custom Exhaust