YEs you need to run a booster or receiver pack with the 120A, only the 1S has a built in booster. Best booster is Mark Jordan's RC Dynamics (
http://rcdynamics.co.uk/index.html) which is not cheap. Our experience is that the cheap ones are not good, and the Novak Smart Boost is both expensive and not good.
If you chuck a note in the 'Wanted' column you will probably turn one up as most 12th drivers have switched to speedos with the booster built in, and have some of these sitting in their pit boxes looking for a good home! Also
try this area, there are loads of 12th drivers looking at that column. HTH
