HW makes speed passion, venom, and orion(not 100% sure on orion so don't quote me on that).
The mouth does look majorly restricting and is it just me or does that look like a plastic pinion? The plastic spur is nice as it'll keep the noise down a lot(I hate the sound of metal to metal meshing)
Depending on the gearing you may not want motor speed over 30k rpm, as the gas engines cannot turn much more than 15-17k rpm. So unless the gearing is way lower, high rpm motors will not work well. On the baja project, I had figured a 700kv motor on 10s lipo would work for stock speeds with a 12t pinion, 5 teeth less than the stock gas engine pinion... That was around 28k rpm...