AndyTom
The F6 has a slightly longer wheelbase (as a consequence, the GTL/F4 and F6 side exit pipes are a different length).
For more details, have a look at:
http://la4ldesylvie.fr/index.php?op...:dimensions-des-renault-4&catid=30&Itemid=101
Thanks for your comment. Appreciated.The F6 has a longer wheelbase, so different chassis. Also the body is different starting from the windscreen, bigger and with a different shape than the F4-4L.