The hobbywing esc set was came with the motor,
for the price, I'm not sure but it cost below $1,000-HKD,
go and check at KWS.
If you got a more powerful motor,
you should modified your car (TT01) to enhance it's chassis strength,
remember all the things should be in balance.
^^~
pkmarc.......
I think we're also born in 60's, right?
I also dropped RC cars for over 20 something year.
Let's check at the RC track and you will know what's the fast car, it's crazy.
Higher KV (lower T), if use same gear ratio, higher car speed which needs more force and energy; means more power going thru the system. So the limiting factors will depends on your ESC W handling capability, motor power rating (or current I) rating, battery C rating (how much amps etc.).