The price they give for the G23 swap is $5,400.00. That is built and tuned. It put out 248.8 WHP and 181.2 LB-FT of torque.

The price they give for the K24 swap is $10,910.00. That is also built and tuned. It put out 229.5 WHP and 159.0 LB-FT of torque.

That's just to give some info from the magazine:
They used the F23 block with H22A head and K20 pistons. H22A has a higher flowing head then the F23 head. The F23 block has iron cylinders. H22A block has fiber-reinforced metal (FRM) cylinder walls making over-boring impossible and it doesn't do aftermarket pistons very well. The H22A head uses 8 ports for oil drain and the F23 block uses 6 so you have to close off 2 of the ports to make the build possible. Also, there is a slight difference in the external water pipe routing between the F23 and the H22A so some slight modification is needed there although they say a piece of silicone radiator hose and clamps works. They used the F23 block components and the H22A timing belt and the H22A distributor. They had to pull apart the F23 water pump from its gear and pressed it into a H22A unit. They used a B16a S1 transmission.