Intake Manifolds There are many advantages to swapping intake manifolds.
Lighter weight and better airflow into the cylinder heads are certainly chief
among them. Of course, this is another piece that must be matched to the rest of
your combo. Displacement, cam and head selection, and planned rpm range are all
factors to consider. In fact, these parts are so dependent on one another that
companies like FAST like to sell manifolds as a "Power Package" with a cam,
heads, and even a carb. That being said, you can look for power gains of 15-30
hp with a wise manifold selection