Need som advice on how to make my d15z1 go a little faster, I know that iÂ´ts vtec-e and not that "tuneable" but I want to do this anyways. So I donÂ´t need z6 head or other swap advices. IÂ´m thinking about getting a p28 ecu and rewire the o2 to 4 wire, then get a hondata s300 to tune it. What do you think? Any downside with the p28 on d15z1? Have read about the tiny trottlebody, does a TB from any other Honda fit d15z1 intake?