They could of done more but it's probably close to most peoples hopped up /6. Not too many go to effort of porting not even in a lot of V8 builds and even a healthy bump in cr is lucky to give 10% hp increase.
You got to have other reasons to build a NA /6 power isn't one of them.
Yah, well, they could have left the stock one barrel intake and exhaust manifold on there and been done with it if all they wanted to do was showcase the slant and it's endearing quality.
