Get a 1" silicone joiner & a coupla clamps off Ebay. ..and no, it won't melt. The exhaust temps has already cooled enough by the time it's gotten to the tip of the pipe plus the joiner is rated to be used for turbos and radiators in cars. Also I've already tested it in this very application as shown in my pic.
U can get it in different angles - u just have to look.
By the way the end of the muffler with the curved tip is the inlet and the end with the bolt-on tip is the outlet but it'll function the same eitherway.