from wat i quote from the supplier 1 week ago.
the Regular kits: Just normal FW05R
The Hop Up kits: has One Way front, stronger graphite radio, and stronger chassis, and come with 4 original foam wheels. it's about $90-120 more, i think it worth the money.
Unless you've got the Oneway front, and buy those bit and pieces.
Actually i am trying to look for more info about it. I guess that Hop-up kits there only avialable from HK, coz many other places doesnt have it,
Hope that help