Here are some graphs of some cars that we dynoed, tuned, and swapped the intakes and TBs. Some are direct A-B swaps and show the results. Some are Base runs then a rough tune and then we swap the intake and TB, and then fully optimize the tune.
1st is a Stk 07 LS7 ported and tuned: 1st is base, 2nd is base tune, 3rd is ported and tuned completely.
Here is a bolt-on 07 LS7 (w/ headers CA)I base tune and then ported and tuned.
Here are two C6 LS2's with just cai and cat backs before and after tune and Ported intake and TB:
383 LS6 to ported FAST and nice set of heads:
408 LS6 to ported FAST:
Obviously the larger motors wanted the larger manifold more than a smaller motor but we have had an LS2 with one of our ported LS2s on it Put a ported FAST on there and pick up 22RWHP and 30RWTQ on a 6L bolt-on 07 vette.