Yeah, I meant the IS2 (Two) and VS. I know they're going to be different but I wonder how much? If I can get away with the idle and take off (non-WOT) from red lights on a regular basis I'll probably go IS2, but I don't want to lose more than 10-15% in MPG with the IS2 vs VS.
As for head work, they are cut for clearance for valve movement but no port as a couple sources on here voted against it based on their experiences. That on top of the fact that my shop guy have never done a set for the 3.8.
