My relays are on the other side. The only black box on the left side of the tail on my Mutt F4i (several different year parts) is the Rectifier but it is about 4" further forward.

If it's got fins on it, then it's the rectifier.

 

What's the trunk release mod?

 

Looks like he has it setup to tug on the end of the zip tie to release the trunk.

You can also take a longer bicycle cable and re-route it to wherever you want. Some guys put them under the corner of the pilot seat.

 

that box is such a pain in the ***, for some reason my plastics just BARELY fit over it when taking off and putting on. seriously seems like its gonna break. whats wrong??

 

What are you doing back there that requires so many fairing removals? I havent touched mine since I painted it and installed the undertail over a year and a half ago. I even managed to install my PCIII without removing it.

The ABS has just enough flex to get over it, but too many times and you will craze the paint (spiderweb cracks). The F4i tail is already prone to cracks so I leave mine alone as much as possible. If I ever rash it I will replace it with fiberglass just like my lower fairings.