I have a 90 honda civic dx hatchback it has a d15b2 motor that runs great but it smokes I'm about to buy a d15 b from a Freind and I don't know if I can put vtec on the new motor or if I could rebuild the 15b2 and put vtec on it?? Please if you know anything about either it would be helpful thanks my name is Chris from Bartlett tn