My HL510 Z20s (any clue on the "s"? Have only seen " Z20e" mentioned) not a wagon but a 4 door HATCHBACK, with legal elevation/emissions delete, aftermarket flattened cone dual element intake filter (hence the tilt in the hood.. Need hood spacers..), and even with the $40 CHINESE Carb (with rookie damaged adj. needle) It for sure doesn't have all its power but still is as alive as a one legged jack rabbit after some nice fluffy tail? And as for highway speeds, even at 80 it still pulls like I was doing 25, I'm not a mechanic guru or anything like that but after just what I have learned recently I believe there is great potential to bring this engine out of the shadow of its more popular older brothers? UNLESS THERE IS A REASON I DON'T KNOW OF...???