Which upgrade is better for performance gains, cams or a CPR6 intake manifold?

Ideally, the two items combined will provide maximum power gains but if we had to choose one item we would definitely recommend the cams for the following reasons:

a) The cams are cheaper
b) The cams provide a bigger power increase
c) Since the CPR6 manifold ideally requires a tune for maximum power gains, we find that money would be better invested to tune the cams for a better power per dollar ratio.

Otherwise, for people who prefer bolt-on mods and are interested in an option with less installation complexity involved, then the CPR6 manifold is a good alternative.