Today I installed a pair of CNC machined HVC Cycle heads on my RD that I had bought earlier in the year and had on the shelf waiting for the right moment. Overall super happy with them, loads more torque in the low/mid range and a much stronger powerband.
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Music:
https://www.youtube.com/watch?v=2VZCd_0Cv1w&list=FL4VwzHh_n090vDXa_rc82gQ&index=1