Well I just picked up a Y1 with about 10000 miles on it and was wondering... What 5th gears are interchangable with the Y1's, possibly a LS 5th?? The reason I would like to swap the gears is I get horrible highway speed:RPM, and on the track I dont need 5th. So if anybody out there has any input please do. Also the tranny is a white plug JDM B16 Y1 w/LSD!!