Allen put on some WCCH heads on my truck about 2 mos ago, I finally had a chance to run it when the weather cooled off and man it is really nasty now! I was crusing about 45 and softly laid into the pedal so no down shift in the trans and it started breaking the tires loose! This is crazy. The heads have made a big difference on how the truck pulls at wot! Now maybe we need turn the boost up a couple of psi! Allen I will see ya soon!