Hey man , whats up I have an axis also I would recommend the novarossi 5+2 port offroad buggy engine, the only downside is you will have to cut about 3 mm of the crank output shaft. This is not even a downside because with most custom engine swaps some modification is needed. And go for the sport version if you want one thats easier to tune, the race will be faster but needs a longer break in and more attention