Once again late to the game, just checked it out.
I've tried the K&N Typhoon, Airaid, K&N drop-in, and M design........They each have their unique qualities and I found none of them to be a complete standout Or the holy Grail for sound and performance. Keep in mind, this is all using my butt Dyno so there is absolutely no mathematical or empirical data accuracy. As far as sound goes, I probably liked the Typhoon the best.......As far as giving me easier and better access to the transmission dipstick, M design Takes the prize on that one. If this one Posted turns out to be a winner, I'd love to try it. Why not? I tried every other one. LOL
Side note,If anybody happens to talk to them, you could also let them know that there was no 2009 MKS with the 3.5.....All 2009 got the naturally aspirated 3.7 ......They just might want to update their website.