Join Date: Feb 2002
Location: Cincinnati, OH
Bullitt Year: 01
Bullitt Color: B
Bullitt Serialized Number: 01118
Anecdotally, I haven't seen too many filters offer measurable, dramatic differences in air flow such that you would notice a huge difference in seat-of-the-pants feel on Mustangs in this current generation. Yes, right now it's too early to know precisely how an aftermarket filter might impact performance. I do agree that you might eliminate the need to change them, but I also have heard more stories about drivability issues from people not cleaning them properly.
That said, I have used K&N filters in the past on cars. I just have not used them for the last 3 generations of Mustang I've owned.
2001 Ford Mustang Bullitt - black, #1118, VIN 1FAFP42X21F213026
2009 Ford Mustang Bullitt - highland green, #6323, VIN 1ZVHT82H995129122
2019 Ford Mustang Bullitt - dark highland green, K1254, VIN 1FA6P8K06K5500726