In my B4 I'm currently running Losi Xcelorin S with 6.5T. Very good and reliable.
However, I've recently bought a B44 and for that installed the LRP SXX TC ESC. I was very pleased with its very low profile and so have just bought an SXX Competitiion ESC for my B4 and this week I reluctantly sold my Losi gear.
If you want a good brushless set up for less thn £140 you can't beat the Losi Xcelorin. A SXX Competition + X12 motor will cost almost double that but the main advantage for me is the very low profile ESC - not nudging the roof of the body and not requiring a fan.
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