I've got the pimpbikes undertail on my '02 F4i as well. I had the clear alternatives integrated tail light installed along with it and in my opinion it looks awesome. So much brighter and no more little circles. The weather has been crappy in Jersey for a couple weeks and I haven't had time to get decent pics of it, but they'll be here soon.

Nice work with this!

 

A clear taillight would look amazing!!