Highside20 Tue Aug 23, 2011 9:04 pm
Yes, in theory you could take out a .1 shim, or go to a hotter plug. Most people are already running a P3 type plug, which means your only option is to pull a shim or just leave it as is. I like the new fuel for the .21 engine, but I was not super happy with it in my .12.
Mike H.