Click sound, falling idle, backfiring when cold starting

doubleextramayo

XS400 Enthusiast
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Hey all. So like the title says, I have an odd click noise occurring lately. Was messing with the electrical recantly, but that was just to clean up the mess that the PO left me and to install new turn signals. I feel like it's completely unrelated but not going to rule it out just yet.
Anyways, the click is usually accompanied by some small pops coming out the back end. It also makes the rpms skip a little bit. Misfire perhaps? And when I slow down and come to a stop, the idle will fall until eventual failure. What is that click coming from? Also, it's important to note that I have a fairly large hole in my exhaust. However I've been riding the bike like this for a while and besides the noise and a bit of gurgling and grumbling from back pressure, it's given me no trouble at all. Maybe I've been riding like this for too long and now I messed something up? :shrug:
Attached is a pic of the hole.
 

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