How important is the head-shim? I run Tornado (%25 "Ready 2 Race")fuel, so I guess when I get around to breaking my F11 in I'm going to use an OS P3..

I'm about 100m above sea level btw.. I normally never mess with head shims..

Quick search on German ebay for the hot Nova plug you mentioned..., nothing... Could probably find it in a shop somewhere, but I've been looking at ordering a 3-pack of Bullit plugs for the RB and my Argus and Go engines..