Exhaust joining

Here's my tale. I need to extend some header pipes with a 45' bent angle piece before it reaches my mufflers. The headers are aftermarket 1.75" OD single-walled pipes (and about the lightest headers I've ever felt - they're NOS Hookers). Is there a nice way to join two pipes of the same diameter without welding, i.e. some kind of coupler clamp? ...or perhaps cut one pipe on two sides, expand and clamp over the other?

Thx.

Alex