I bought my mandrel-bent 90s from here:
http://store.racing-solutions.org/mandrelbends.html
2.5" X 4" radius 90 degree aluminized mild steel for $13.17. They have a
limited selection of stainless stuff too. 3" X 4" radius 90 degree for
$22.
I got a box of them for my side-exit exhaust project. I had to go up
and over the frame then down and out the side. Lots of bends. My
little Lincoln 110v flux-core welder is awesome for this stuff.
http://faculty.otterbein.edu/tpindell/truck/dscn2105.jpg
http://faculty.otterbein.edu/tpindell/truck/dscn2114.jpg
http://faculty.otterbein.edu/tpindell/truck/dscn2113.jpg
Tim
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