Originally Posted by Maxwell
The intake manifold is a pretty damn good, in fact it has the longest designed runners in the industry.
Long runners are good for torque and that's it. The factory manifold actually has both long and short they are controlled by the ECU.
Originally Posted by Maxwell
I wonder how much more CR the heads will allow...
The heads should be fine provided there is enough valve clearance, the weak links would be the hardware
(head studs) and gaskets.