M factory I was going to try I have a road rally car for night road events they list one for the Sentra,primers and sr20 so going to give the a ring they do a 5.1Hi fellas! On our rallycar (Almera N15 GTI) We would like to lower the gear ratios. is it a good idea to only change the final drive? 5.000 final ratio would be great. anyone who knows where to purchase a set of final drive gears???