i have ran the 1500 contra before when i had the oem var...it gives a bit more top actually, slowed take off some....shaka suggested the 1500/9g set up...8s came with the var, have 7.5 today, felt tug, slow take off, hit "3rd" softly and quickly.. i liked the 7.5 with oem hit mid hard,even tho slower takeoff,hit quickly, this var is diff....