I ended up removing mine, for a few reasons:
- The bolts aren't torqued properly as the QB comes (the kit comes with a big warning on this, though I could just have torqued them without removing - read that)
- The tank skin edges needed a little bit of trimming with a file to not overlap - they originally looked like this:
https://4.bp.blogspot.com/-FxeKWfgG...3NABvZ1rVjwCKgB/s1600/IMG_20161129_013118.jpg
- I wanted to install a fuel return line, had to install the fuel sender and different (retrofit) fuel caps, which was all much easier with the tanks alone on the bench
- Without removing it, you can't easily leak-test the rear of the tank (you can do the pressure test and see if it leaks, but it does, you'll need to figure out where)
Other reasons that didn't apply to me:
- If you want to install the included stall warning tab, it's much easier to get access without the tanks
- Some people install leading-edge landing lights, also much easier without the tanks
That said, removing and reinstalling the tanks is quite easy, though a tad time-consuming (a ~hundred screws and ~20 bolts)