Anneal it, take a blow torch and gently from a distance then come closer warm the pipe, watch it turn colour, let it go to purple moving the flame all the time, then take the torch away and let it cool, then do it again and let it cool in the air. You will be able to feel the pipe move in your hands, just gently reshape it. When it feels like it's resisting anneal it again.
I suggest your try this out on a piece of scrap first to get the hang of moving the flame around and what it feels like when it moves and when it's resisting. When your ready for the coil anneal little bits at a time then progress around the coil, wearing gloves of course. Some guys may tell you to quench after heating, it will work without quenching. Quenching a coil like this at the right time will be practically impossible unless you have access to a oven furnace.