@tinwelp thanks for posting this up and sharing. Great to hear that it is an improvement! Down here, +30Deg C and both my fans are constantly singing... I really prefer not to ride when it's that hot out and especially not on road as heat soak can see temps skyrocket further. Have too back flushed, burped over and over but have never been able to calm the heat. This new impeller kit adds that extra bit of love as does a second fan with a lower set point... Where did you source the slightly longer dowels? Good find! May I have Tony's email address by PM too? TIA.