What numbers are people pulling with AUDM K20's with I/H/E? Or even K24?
From what I could find, most were around the 130-140kw mark. 150kw for cam or JDM motors?

That's not a far cry from a healthy B18CR pulling 120kw~.
The torque and power delivery of a K20 is definitely superior and their gearboxes are killer. You get what you pay for, the extra spent on a K series is totally worth it if that's your power goal. Why do a motor swap then build it up. Unless it's a wicked crate motor :O

But I agree with dougie, the B series does have it's charm.