I am generally not pleased with my d16y7. I have a short ram intake, headers, exhaust, no cat or resonator. I understand its a weak ass engine but I dont know whether to swap it with like a DOHC ZC because that all I can afford right now or build the d-series. If you say build then give some info on where to start and what to do. I am basically looking for any and all opinons on this right now. Thanks.