Makes sense.

When I was researching header designs they said one of the biggest factors to compute for was vacuum. To help draw the exhaust out. They were saying the size of the exhaust valve(s) could be smaller than the intake and perform just as well if the right diameter and length and all that could help draw the gasses out. Our manifolds are definitely not doing the job in that area. IMO the valve should be bigger or there should be 2 but they couldn't fit another.

I like DOHC 4 valve heads. VVT on I&E. The oppurtunity for better flow in and out. Center spark plug. But look at the difference between the M119 and M113 in that article. The real world outcome was intense to say the least.