[Shane@DBPerformance]

I was only talking about the exhaust side.

Just remember, bigger isn't always better. Higher numbers on a flow bench also doesn't always mean more HP. The intake ports on the 4G63 heads have gotten smaller and smaller over the years. The Evo has even smaller ports and it is probably a better head than the 1G and 2G. Usually you want as straight of a path from the start of the intake port into the combustion chamber. This often requires raising the intake port floor and getting the ceiling up higher in the casting. The idea is to keep the air velocity up as high as possible throughout the entire intake stroke to get max cylinder filling for the RPM range that you run the motor in. Huge intake ports can often hurt low and midrange power.