nah i never owned a OS, that was 3 mates of mine. the OS is good, but no where as powerful as the sirio, or nova based motors. i think the OS just needs a bit of dremeling to free it up. a mate did this and it was as quick as a LL nova out of the corners, not sure about top end as it was run only in a small area. gotta go to moorebank to really test the top end

runner time is good man. it's definately one of the benchmark fuels.