I loved my a1 too while I had it. It depends what you want to do with your car. If you want boost keep it, if you want all motor or more of a built engine with boost sell them. I'm not saying that you can't build the engine, you just might want vtec. Another option is to sell the head off of one and sell the other and buy a vtec head and go ls/vtec which some say is better than just a stock b18c1.