Muffler fell off ran great. Put Muffler back on now no power

[StashTheHash]

So as the title says my muffler fell off Thursday after a little crash. I put the muffler back on with a new metal gasket. Now there's no power. It starts with some peddling but won't pull me well and won't idle. I've tried playing with the carb with no avail. Everything feels and looks tight. Any ideas? I'm at a loss now.