my suggestion is to just save up and get either the H22 or the F20. Well worth the money because DOHC heads always have the potential to make more horsepower. If you just want to swap heads, that's fine but it may end up costing you about the same because you're gonna have to buy the head, get it machined evenly at a machine shop, buy a new head gasket (coolant, brake cleaner, engine oil and filter, silicon, etc..), and the labor to do the installation correctly. It all adds up unless you're a mechanic and know how to do the labor portion. On top of that, you need a different ECU and possibly some additional sensors (Maybe. I'm not too sure.)