Did an oil change today, my second with synthetic. Surprisingly, the old oil was disgusting after only 4K miles on its first synthetic batch. Hopefully that was just because there was still some crude oil that got left in the block when I did the first change. Put Mobil1 in again and it's driving so smooth now, esp with that new air filter I installed earlier this week. I got on the throttle a bit last night and I'm pretty sure I'm still pinging above 6K RPM's, which is leading me to really believe the spark plug gap is my issue. Eagerly waiting for the WeaponX plugs. When I change them I'll also do the EGR mod.