More testing in SoCal today at Thunder Alley. Stock EB/JS, went to a NovaRossi 9901 pipe with short/round header from running an 086 and an OS P4. Ran an OS P5 plug. Air temp 75...12 minutes of run time consistently...engine 190 degrees.

Very fast ! and super smooth with this pipe. More over rev and top end as well as good torque.

So far we have tested 086,RE10 and 11,RB2045...the 9901 looks like what several of us will be using.

The OS P5 in the stockers and race preps is the way to go for warmer air temps. OS P6 in the mods. With the pipe and plug combo we had to lean the engine on top at least 4 hours.