Be careful running 5s on the P51, on a full battery and with full throttle you will be pulling very close to 65A (depending on air environment). A 70A or 80A ESC would be a better fit for 5s. But I've heard of many people using 5s with the stock ESC with no problem. But just be careful.
We do have a 5S 4000 on the way. However, I would caution you about using 5S in an FMS plane. FMS recommends against this because there have been problems. Please know you ideally should upgrade the ESC to do this and quite possibly the motor if you are doing a lot of sustained WOT.
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