I run a Sphere Comp in my B4 and so do most people I know. The basic Sphere is also perfectly OK for a buggy, and plenty of 4WD runners use the Sphere TC-Spec with the fan. The LRP Vector X11 13.5 is a good motor but depending on your skill level it may soon prove not fast enough, most buggyists will have 7.5s on average (the crazys can go down to 5.5 on some tracks but a 6.5 is usually as low as is sensible) I've got an 8.5 in my Losi and its sweet but not the fastest thing out on track.
The Bullet SPX is ok too (its basically a Sphere with a new sticker on as the Sphere itself is obsolete now). I run that in my vintage RC10 with a 10.5 "Stock-Spec" LRP motor.
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