I might be trading my d15b vtec eg for a 91 si with b20b swap but I'm not really knowledgeable about this motor. I tried looking for anything on it in this particular car but can't really find answers so if you know of a thread and can link me that would be great. But I wanna know the pro's and cons of this swap in the ef, and whats the average gas mileage? I tried looking that up and found a few different answers. Sorry I just never really looked into this motor at all so I pretty much only know that its non-vtec and good for boost apparently.