Maybe, lol.
Tuning these cars NA does little to nothing. The computer with the right meter and injectors will beat most if not all amateur tuners.
I've had a bunch of heads, intakes and cams. All ran just fine and made the power they were supposed to.
Some of those parts included a massive cam and extrude honed twisted wedges.
I used to watch my buddy put all these home built and tuned messes on the dyno, only to be beaten by simply returning the tuning to factory.
I disagree with that statement, but to each there own. Same boat, quite a few different NA combos and proper tuning ALWAYS made a difference on the dyno and especially drivability. But those are my experiences.
You didn't answer my question about the codes.
does not matter about how good those heads are he should 'feel' a difference. Something is amiss.
I agree, there is just something not quite right. He should feel a difference.