This seems like a no brainer to me, but I'm still nitro-tarded so I wanted a second opinion. I have a Hyper 7 buggy with a Hyper .21 engine in it that runs pretty well. I also have an Axial .28 Spec 1 in an XTM Mammoth that is waiting on a new spur gear (I hear this is a very common thing to have). My question is would it be worth slapping the Axial engine in the Hyper 7? I've read that .21 engines are better because of the higher RPMs but I don't race, just bash. I know the Axial in my Savage is bad ass, thought it might be fun to see one in my buggy. If I do swap it, is there anything i need to be wary of? Any input would be appreciated. Thanks.