Did you put in the cone filters or the airbox replacement filter? If you're curious about the Dinan chip, power really comes on from 3500+. Can't say much about the Jim C as I do not have it. For anyone wondering if it makes a difference, it does. The pick-up (acceleration) was much smoother and responsive. Neat sounding as well. Next up is the chip(s). I hear the conforti chip is the best for a 750il. Any comments?