I dunno about Dynojet, but the bloke who did my upgrade HAS got dyno results for various engine, ECU, &/other other upgrades that he
will talk about with you; but he doesn't publish those results or advertise them, largely because there are sooo many variables involved that are not in any way under his control that can make
YOUR specific results a bit different.... (or a lot! :shocked: ) Even things as small as each day's ambient temps, a different tire size, &/or variations in tire pressures can make a fairly significant difference to Dyno readings taken via the driven wheel/s

And while the bulk of the upgrades that he does are sanctioned & done under licence, there is also the potential for people using them in a way that's not strictly recognised as being legal &/or appropriate under the terms of his licencing arrangements... so there can be a whole heap of reasons for not providing specific performance details beyond just not making a big enough difference or showing the world proof of any gains! :lecturef_smilie:
However, all that said & considered, as others have already mentioned a number of times, with most modern 'computer controlled' engines and their abundance of sensors reporting on a whole raft of variables, then quite bluntly, there's just not a great deal of scope for getting any significant gains or performance changes without changing some of the embedded specs/ranges via an ECU Upgrade or at least skewing or changing some of the variables being fed back into that ECU that controls the engine running &/or output!! Even back in the days of points, plugs, carbies, & jets etc, you just didn't get all that much in the way of performance gains without changing some of those critical parameters, it's just that you could make those changes yourself rather than re-programming a printed circuit..... :dontknow:
I reckon it duz'n matter much what you do, you just ain't gonna get much performance for little
real change in anything but noise!! :banghead: