Originally Posted by Zerodefect

Yes, I'm running Byrons Gen 2 25/9 fuel. It works noticeably better than the Trinity 20/12 I was running.

The #4 is hotter. The tracks I'm running on are tight and big, there is alot of off power turns and idle time during a lap. Its hard to find a pit guy that isn't slow. And its getting cold out.

The #4 offers better idle, less flame outs, and is easier to tune. When it gets warmer I'll use the #5 plugs.

I tried th OD #77 plugs and they were ok, the Novarossi #4 seems superior though.