I've always used the same Dyno at Hdev on my DE, at no stage have I taken any bhp figure given as a true measure of actual power, however I do take note of improvements from the first run conducted in gains from the mods done.
The first Uprev map and service gave a figure of 281 and after the map 295.The only mods were exhaust and HFCs at that point.
Yesterday after new plugs,clutch, plenum spacer and 06 airbox mod with performance panel she ticked just over 306. This wasn't remapped just put on the dyno to see whether anything had changed.
Engine wise it would seem I had a strong car to begin with and the service history shows no more than 7k miles between services and it's now on 92k.
When removing the old plenum to put on the polished one (bling) it was noted the oil filler surround was clamped between the top cover and the bottom indicating a spacer had previously been fitted by an ex owner, when doing the clutch we discovered a short shift kit had also been put on by a previous owner.
In short the previous keeper of the car was an enthusiast that cared for it very well, the way it drives overrides dyno figures for me tbh.
On a side note there was an HR at Hdev lovely looking nismo kit plus usual mods etc that had recently had uprated cams fitted and it was pushing out 346 on the same dyno.