When I first tried the 'race' fuel I thought I felt a major difference but I think I was kidding myself.
The best I can get is 93 octane and we are lucky enough to have a non-ethanol supplier nearby so I always get that. Those plugs are NGK 3520 BR8ECMIX Iridium IX Spark Plugs but I have yer normal ones too. I'll dig them out.
Also I'm running without the top of the filter box but I have the unaltered OEM top AND a four holer.
