Here is my dilemma- car is stock, 5spd manual. I am looking for MPG not 1/4 times. I have a leaking valve, so the head is coming off. This should be the 102hp version. Is there any head I can put on in place to get realitively same MPG or better while keeping the HP same or better? Is it worth going to a SOHC VTEC? Should I just have my head redone and put it back together? Thanks