Go with an LRP ZR-28 for $160, or for a few bucks more, the ZR-32. For $200, the ZR-32 is a wicked engine. It makes a lot more usable power than the Novarossi 28-7 RT I replaced with it. I have one in my OFNA Ultra Comp, and so far haven't found a brushless buggy that will outrun it, at least...