Originally Posted by
Bigedmond
Mine run 270ish with a race tune. I run od97 plugs. The p4 work fine, but cost twice the od plug.
+1. I first tried the 97 because of the cost, but am now 100% convinced for most conditions it's the better plug. From my testing, the P4 narrowed the gap of hitting a good tune. The 97 provides rock solid idle, crisp bottom, last longer and is $5, what's not to like?