The rear lights shown in that vid were easy to install (some two core wire from the front interior light) link to a mini guide in my build thread (half way down iirc) http://www.focusowners-social.com/fo...=10979&start=0

And with regard to the remap a friend of mine from focusowners had got ~142bhp out of his tdci and i used to have a remap for my TDDi which was around 120bhp. I'd say go for it as it really did give mine the much needed umph it was needing, but if you do go down this route look for a map that ins't aggressive and go for one that delivers power smoother over the whole range, rather than one big lump.