Boss 8AWG kit is NOT 8AWG. be aware. Probably closer to 11 AWG. See Amazon reviews
Now, with that said, I am so NOT expecting issues as
a. the powerline run length is usually max 6 ft on the bike... the longer the run the more critical the thickness of the powerlines become
b. B4 is Class D, so not drawing much Current (I would be surprised if it would pull more that 10A...)

the one thing is I would replace the fuse on the Boss with 25A or so... not sure what it comes with...

 

Will probably be doing the same
Infinity kappa
Rockford amp
Stock head unit

 

Added to my system.

Ordered a head unit, Kenwood KDC-BT858U

and the Biketronics BT 1005x and faceplate.

Spoke with Bill, what a great buisness, if only all were run this way!

 

You'd be surprised how much difference the head unit will make.