Yes and no. Yes if they disassemble the
and send it back to a lab (probably somewhere in France). No, if you are referring to your average dealer. Unless the
is changed as part of the remap, in that case, a visual inspection will reveal all.
You still need to declare the remap to your insurance company though.
As to cost, I don't know about Renault's, but my Octavia RS was remapped by Jabbasport and was around the £600 including rolling road time and print out of the vital stats (graph