ok thanks. I just quickly looked up what can cause engine knocks, and it said that one big factor is a lean air/fuel mixture. I have read that when people get CAI's theyre cars run abit lean and need to get tuned. Well i have that and the hv3. So if it was running lean already, would it run even more lean since there is maybe even more airflow? Is it possilble to get a stock pcm tuned or only custom ones? i am going to get an Overkill pcm soon. Would that cure the lean mixture if i do have one?