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Did you notice a difference in the new ones driving?
its probably placebo but Yes. Also doesn’t help that I also added sprint booster (Love it) and Cobb 93 tune + Sequential PDK tune at the same time.
entirely new and different car now.
Not to be negative, can someone tell me, do these IPD plenums actually really do anything?
You'd be best off asking Tyler from APR. They've tested a ton of combinations. Not really sure if they tested any intake plenums, but I do know that they've tested headers & sport cats (no gains, including muffler bypass) and intercoolers which do actually help quite a bit in terms of cooling the intake air and adding some HP and TQ.