been giving that some thought as well ... i've done this all three of my neons in the past to make room for a large cone filter. only reason i have not done it in the XF is cause i really don't need the space and the cable weight that is added is prohibitive as well.

i always run both a positive and negative to the back ... never liked the installs where you ground to chassis cause over the years those tend to fail especially in damp weather. don't forget the 200 amp wafer fuse on the positive wouldn't want any more charred crossfires.