Just installed the duel filters and yes there is a major difference... The throttle is more responsive and the engine comes to life when you step on the gas. Now I just need to get my break-in period over with..
BTW, I have had K&N on all the cars I've owned and have never had any problems with them. So all the sensor problems and dust is crap.. Just clean the filters every so often and your good to goooo.. Just like with everything else, maintenance...