with the B20 swap they mate a B16B head to a B20 bottom end out of a CRV with that it should rev prety well. otherwise the B20 head is very tame in comparison for oviouse reasons
Mainly people swap K20's and B18's into EK9's with some cracking results
Going by what spoon said the B18 swap is the best tuning mod to do on a EK9 for more torque and power
The s2000 engine was a FC20 for the 2l and FC22 for the 2.2l but i dont think you can drop one into a EK9 and keep it FWD
with the newer K20 model civics the V-Tech crosover was smothed out and theres not so much of a kick compared to a B16b or a B18 maybe thats why your not liking the car Tim ? plus they took a back step so they could keep cost down with there stupid rear beam sus
On my EK9 i now have a spoon lower position seat rail and cusco zero 2E coilovers and it great on track but if your driving about on the roads it get very boring as you just cant drive it as it should be driven
i found that with stock sus on a EK9 there was a huge amount of lift off oversteer but the coilovers sorted that out and it stays planted no matter what
I know this is all random shit so ill shut up