Yes indeed. I never knew it was a problem, since I fly the intermediate sequence. But Kyle was doing the advanced, and there is a tear- drop, and on the up-line, there are two elements, and the 2nd element is a snap, and it was running out of steam quick. He told me about it, and I started to study it, and then, looked at the telemetry of my other two Daltons, with quads. All three airplanes have same motor and same prop. But, the Yak was down by 500 rpm. Also, all three have same exhaust, which is canisters. SO i knew there was a problem. I discovered, from Day 1, the Yak quad was running rich, and it has clogged the canisters. SO I removed the KS 95 canisters, and installed the pro flows, and tuned the motor good. Now, it is a rocket!