Muffler fell off, still have the pipe, what do?

[ds1615]

So I was riding my scoot last night for a few hours, and when i turned around at a church the muffler just fell off!

Well I rode it home broke muffler and parked it, today I took it for a spin. I just read that no muffler will affect the engine and could cause things to get too hot. So I also noticed that it had a decreased 10-20 percent performance, and was no longer able to run my normal 40mph was lagging to 30mph.

Do I need to have it welded or any ideas? Don't have any money right now and no work currently until my boss gets a new contract.

HELP!