thunder power 15c 4200 3s
 

from the poly light series? i think thats it, what do you think performance would be like in a 5700mm 4 tec? i have a chance to get one reletively cheap let me know thanks!

noone wants to give me there two cents?

That should be plenty for the 4tec, as long as your gearing doesn't push too hard. I would personally go with the 20C series, but if you are getting it on the cheap then it will work pretty well.

Do you have a temp gun?

yea i have a temp gun, yea the guy will do it for lik 80 shipped, i though was great