2004-up 883 Sportsters have different primary and secondary gearing than the factory 1200’s (final 4.07  vs. 3.52 , and it's recommended lowering the final drive gear ratio when converting an 883 to 1200, which is what I've done. My questions... has anyone out there changed gearing? Cost - for parts and labor? Can you go a bit lower than 3.52? Thanks in advance!