I have a question which Im kind of embarrassed to ask.. but i will anyways:biggrin: So far i have the AEM SRI on my car (soon to swap to a CAIopcorn, DCRH, weapon R defouler, LOL, and a full on custom catback set-up with a 2.5" piping all the way, no cats. I've noticed that about a week or two after putting on the DC race header, after i hit :vtec: acouple of times, and the engine is warm, hitting :vtec: in 4th or 5th gear isnt as loud or is unnoticeable. I'm guessing that my powerband is more stable with regards to the curve, but does anyone have this "issue". I also notice this if I downshift coz of traffic and i hit it again, sometimes i really cant hear the :vtec: transition... maybe from heat temps in the engine bay? powerband curve? Any ideas or answers?...opcorn: Thanks guys!