The lack of flow really starts to show up around 5000 rpm. In the above example, it was a very delicate balancing act to get the engine to pull well to 6500 rpm consistently, and not drop off after 6000 rpm. Ignition advance was critical, and will be even more so as ambient temps and humidity increase through the Summer and the cylinders fill a bit less due to reduced air density. This will actually make the RU-2780s under the bearclaw look better using corrected numbers on the dyno - one of the pitfalls of dyno numbers as ambient conditions change.
Based on what I have seen with larger filters and a cut or custom bearclaw on a similar R3, there is another 2-3% possible with the Jardine full system. More if the intake air temps are lower.
Every 5.4° F (3° C) that intake air temps drop, gives a 1% increase in output.
This means that pulling 20° F cooler air into the intake (not from behind the radiator or across the hot engine) can be a substantial gain. This means that someone needs to produce a well designed heat block for the R3s using triple filters, IMHO.
Using an exhaust that is more efficiently length (pulse) tuned than the Jardines (such as the Predators, etc.) will show an even greater improvement. The R3 really wants longer primary lengths on the header than the Jardines provide. Inline engines (especially 3 and 6-cylinder engines) are not particularly sensitive to collector length compared to primary lengths, but getting the primary and collector lengths correct will give gains at all engine speeds and loads. This means that the intake flow needs to match.
Clear as mud now, right?