I the esc is only rated for up to 3s....so before you order, double check the specs. I run my crt.5 on a 3300kv on 3s and it is plenty fast.....on 4s you may want to change to a different esc
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S