hey guys i was thinking of putting the nitro star engine into my ofna mbx pro and i just want to know what gear ration shoudl i get and will it make my buggy any faster low and top end also is this a good idea at all or no

The hpi engine!! for more power you need to go RB/Nova etc if you got the cash, Ho Bao Hyper 21 8 port if you haven't

umm yeah

does umm yeah mean the hpi engine, i'd reconsider have no direct experience but hpi are not known for power

Nitro star and I think Savage. Lots of low end and er...... thats it. Get a Picco P3 or P7-R if you want power on a budget.