From what I understand, sportwerks is closing if it is not closed already. So be aware, repair parts might be hard to find. I would go with the Dynamite .21 or the 3 port Nova. Both are good engines and will push your ST-RR around. They will get good gas milage also. As you get better, upgrade to the Ninja, VSpec, GRP or higher dollar Novas. Have fun!
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Losi XXX-CR
LRP Sphere Brushless
HB D8
Trinity .21
Airtronics
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