ordered Friday afternoon and received Sat (thank you for the quick ship HPA). love this mod so far. install was easy (hardest part was finding the right tool to get the airbox cover off) and the sound is more aggressive at higher rpm. I'm actually noticing that the car feels a bit quicker or more responsive, much as GT3 noted. In fact, I drove it around some twisties last night and the car has never felt so quick (though, it should be noted that it was also much cooler in LA last night (~59 deg) than it has been considering I bought the car mid-summer).
'07 e92 335 (sold)
'08 e90 M3 (sold)