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Pretty happy how the engine is running now on the twin DHLA40s, especially now the accelerator pedal can open the throttle plates fully Running 30mm chokes with 119 main jet and 200 air corrector. It's all good until about 6100rpm when it becomes a bit sluggish. It's not leaning out, I've played with smaller air correctors and 130 main jet and holey .10 emulsion tube and race tubes both .5 and .7 and I can vary the mixture from 13.2:1 to 12.3:1 at 5500rpm. It's not over rich, a 116 main jet gives 12.8:1 and behaves much the same at high end, but starts a bit late, so midrange is weakened, and I'm not extending idle jet or messing with progression holes to counteract. Once I reach 6000rpm there's some hesitation. I know engine will hit 6800rpm with the Pierburg or a twin choke Weber DMTL on the GK manifold. I'm using trumpets with Ramair foam socks. They are a bit close to the firewall, but I think I can see ram effect pressure (from -8psi cruise vacuum to +0.3psi). Three ideas 30mm chokes are too small foam filters are compressing into the trumpets to not let air through the Aldon Amethyst rev limiter is very subtle (set for 7000rpm, original Dignition limiter is 6800rpm and sudden) So, realising the dello's have been on for 2 years I have given the foam filters a good clean with the raidHP/ramair cleaner and I'll re-impregnate them with the correct polymer snake oil. Might have a short blast without the filters. Or try again with a Sorg inlet plenum but that makes jet changes annoyingly hard.