The consensus you describe about what should do what in all circumstances, dunno, things aren't as prescriptive as you suggest. Others can decide for themselves whether to accept or reject my dyno results, it's up to them.
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Its not that we disagree with 136kw, that seems perfectly reasonable, its the 123kw that is suspect.
If I had a ECU map and a DP fitted and made 123kw I'd be looking for answers and I'd be looking at the conditions on the day rather than at a fault on the car.
Fair enough, I was a bit baffled too by 123kw, but before that, my first ever base run (tune, CDA) barely struggled to hit 120. With custom dp, it hit 123 consistently so in my case there was some improvement. But yes, my base figures have never been that high. In my case, the results change dramatically once all these mods are working together, ie intake, exhaust and FMIC.