build one and scheme/cover & bash it to your liking.
nobody has a 4* that looks and flies like mine.
the 4 * is a great kit for bashing.

there's more veriables beside power to obtain speed
prop pitch and size, airfoil shape, fuselage shape, over all wieght.

some air frame are not designed for speed.
control surface flutters or integrity of over struture.

depending on what type of flying you will be doing... torque might
be better than RPM.

a .46 TT will pull a 4 * .40 with plenty power to spare.
depending where you fly...you can take the baffle out of the muff to get a little more power.
not sure what the top speed is... 75mhp easy, probably way more.
you can experiment with props to miximize speed, or put it into a power dive.lol
but the wings or control surfaces might take off on ya.

i clipped the wing 2" on each. less drag and increased roll rates. less lift of course.
it has better speed than other 4*s at my field.
i lower the diehedral...i ain't no rookie. It'll still float anyways.
extended the rudder to help snap rolls and kniftegde