HK is doing a contest on fast speed run and I recommend the Mamba Max Pro SCT edition because it is lighter. The RX8 is a very good esc but due to weight issues, I would prefer the MMP SCT. Handles up to 6S. now if you go higher then 6S you may consider using a helicopter esc for some insane 12S. I'm thinking about building a speedster drag to break the record. I believe the car that broke that record was a Custom Works direct drive dirt oval car converted, but I could be wrong.
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