I understand, I've read all about intakes and needing tunes. K&N website says tune isn't required but you should still tune. With the latest generation ECU's they can tell your top speed, revs, g forces etc. When I took my CVT WRX in to claim warranty on the transmission blowing up they sent a image of the ECU to Subaru Japan, they sent back my top speed of 240kmh and max revs of the vehicle's redline. They also made note that my car had semislick tire's (Same as the ones I have on my STi) and voided warranty because Subaru Japan determined that I tracked the vehicle. Sent from my iPhone using Tapatalk