I'm quite confused on the base of these 2, I lack knowledge of both. What's needed? I'm at 64k miles and just started kinda modding the car after warranty died. I see a lot of people gutting the pcv is that necessary. I'm on a 93 tune, CAI, and axle back system. I plan on putting an intercooler on very soon from cvf and possibly tuning to e30 maybe. I just need to know what to do to keep my eco good and need more knowledge about this topic.