It will bend 1-5/8" better than 1.5". The 1.5 inch die you get w/the bender is for pipe which measures the inside diameter not O/D.
You wont need to use heat/as much if you first pack the tube w/sand and tape off the ends. I have gotten nice decent bends by letting the tube/sand heat up in the sun prior to bending. Also take your time and don't force it, the slower the bend the nicer it turns out. Also the less of a bend you need the less chance for ripples. If you fab up a jig(wood or copper tubing) you can get an exhaust shop w/mandrel bender to bend the tube for you, most charge between $5-10/bend. Depending on how you design your cage, you could have the shop bend your 90's and use the pipe bender to do the other angles.
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