I did the same thing myself
http://www.mig-welding.co.uk/forum/album.php?albumid=1349&pictureid=7554
yeah there not really made for exhaust type stuff superbad!
I know now,I've sold it on. I know I need a 16 ton hydraulic one,finances don't permit right now.
That won't bend 2" thin wall tube very well either, the formers are sized for pipe, (2" pipe isn't 2"OD) and they don't offer as much support as tube bending formers. It's possible to buy (or make ) tube dies and followers for Record plumbers/conduit benders which will do a decent job on up to 11/2" OD, but 2 might be stretching it. I had to put a longer handle arrangement on mine.