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Just subscribed to your channel, love your approach to testing, i.e. real-world vs dyno. Been playing around with my RE Hunter here in the USA. So far, I've fitted the DNA filter and cover, the Kent stage 2 cam from Hitchcocks, and a tachometer (rev-counter). Based on the performance gains thus far that my "seat of the pants" scale gave me, I've changed to a 16-tooth front sprocket. The back roads in my part of the USA (north central New York state) are mostly 40 - 55 mph (64.3 - 88.5 kph), with hills. In the original configuration first gear was pretty much useless, I couldn't even get across an intersection without needing to up shift. I now ride the bike more like it's a four speed with an overdrive, than a five speed (fourth gear will now take the bike to 70 mph (112.6 kph)) at about 5900 rpm. Now I can use fourth or fifth gear to keep up with traffic depending on conditions (headwind or hills). In regard to the exhaust system, I keep switching between the stock silencer and a KP Performance unit I ordered from "The Bikerz" in India (Neeraj is great to work with), this is based on personal preference. Much as your testing has shown, while the KP Performance unit is throatier in the low range, it's also louder when on our highways. As I suspected, the cat pipe doesn't harm the performance enough to tempt me to change it. Keep up the good work you are doing, I know many who are reading this would be interested in the mileage vs. performance results you may note from your testing of the FuelX Pro+.

How do you know what rpm you are doing?

Eagerly waiting for the 2nd part

I have cut open the stock filter cover to make it like the dna one! Almost all the perf gain, none of the cost😎

Thanks for a great test series. Very informative. Considering that expansion chambers on two strokes did wonders for power scavenging, I wonder how much effect expansion has within the pipe flow of a four stroke single. I have both the Delkevic down pipe with the matched 9" / 225mm oval end can. In this set up, the first expansion occurs as soon as the exhaust exits the cylinder head, going to the larger diameter of the down pipe. But then the short, double bend connecting pipe (see Delkevic's photo of the components in the kit) expands a second time at its rear end, where the even larger diameter of the actual silencer sits over the connecting pipe. I never did test my set up without baffle, as I knew that even with it, it would already be very loud, and, in general, I always prefer the somewhat refined sound quality with baffle as opposed to a raw sound. But even so, I subjectively felt the engine felt noticeably perkier and rev happier with the new set up. So, do two minor expansions in the pipework contribute? The bike feels good, but who knows for sure about the technicalities? Would the designers have done this according to certain calculations?

Thanks you, good job!

Can you post a full link to where you can buy the modified part pls?

It certainly made a difference on my Meteor, bum-dyno is accurate.....honest. ;-)

is that on the stock silencer?

my last bike (a honda deauville) had a honda touring screen that had two cut outs in the bottom of the screen - if you completely enclose the screen area you might find that you actually end up with more turbulence than if you allow a little bit through

my Hunter is now 6 months and 1800 miles old. I'd like to replace the exhaust (more for sound than performance to be fair!) and have found this quite useful (in as much as it might not be worth spending the money to decat the bike for 0.14 seconds increase). I do wish Delkevic offered a black-coated version of that exhaust system though!

Interesting, thank you. I found the Kent cam had, by far, the greatest effect on performance.

What's the thing with the blue flashing light?

Interesting choice of silencer. I'd be interested to hear how you fare with it. I fitted Delkevic's full Hunter exhaust system with their 225mm oval end can. I was worried it would be too loud, even for earplugs. Unlike your Amazon end can, the 225mm oval does have a small baffle fitted at the inlet end. Without the baffle, one can look straight through the can, just like with your Amozon offering. Anyway, I fitted the silencer with the baffle and even then, the bike is brutally loud, but thankfully, not obnoxiously so and it's still pleasant enough on long distances (with earplugs, which I wear for most journeys anyway). I posted a couple of videos of the fitted exhaust on my TH-cam home page, if you're interested.