. I have a 94 civic with and D16z6 and an automatic tranny. The d16 has a bad main in it. With the 1500 dollar budget I got I can get a jdm d16z6 or jdm dohc zc. Do not know which one to go with. Would like to hear from someone who has used a zc before. another question is if I go with a five speed do I have to change the ecu and will the axels from an auto fit the 5 speed? If anyone has ever done this please help?