Have HD 02< Shadow Gray, Just finished installing Lower Pulley, Air intake System, adding Diablo 2 stage chip and lowering 2". When removing stock pulley noticed about half a cup of oil in spine behind Pulley, anybody seen this before or know why this oil would be there. Everything works find and what a difference, want to shock a Lighting try this. No leaks before or after. Thanks for infor. Jimbo