5-speed?

any info on the 5 speed gearing for a P? I have been told that there was an old one in the 80s that was shit. but i’ve heard of a new one that is stonger and holds up to abuse. any comments, questions, rude remarks.
Ty

http://forum.sip-scootershop.com/en/thread.php?id=1519

wow thought someone would know about them or maybe links to any info on them. oh well im going to do it so i’ll let everyone know how it works out.
TY