Just cover it with a bigger hole?.... No wait that's wrong. Wedding ring? Wait that doesn't work. Take an 1-3/4" hole saw, cut hole, take piece that came out of the hole you just cut (inside the hole saw) lay it on a piece of pipe the same diameter as the pipe your trying to fix. Now hammer it around the pipe to put the proper bend in it. Take this bent piece of steel and use a hose clamp to hold it to your exhaust now weld it. Done.
If this is not possible go too Napa or some other real parts store and get the correct size band clamp and use that. Otherwise buy my really clean stock chrome header pipes that nobody wants to buy for $100 plus shipping.