OK, I have searched the forums and not found this topic discussed. One of the biggest complaints I have had with my truck since installing the flowmaster exhaust was the loss of throttle response and lower end power. I have been told that the loss of response is do to the DPFE sensor common on Fords. The DPFE sensor regulates when the EGR opens up and dumps unburned gas back into the intake to be reburned. Since there is less backpressure with the new exhaust the DPFE sensor is reading more exhaust flow. I was told that there are ways to do a DPFE sensor delete but I couldn't find anything. Has anybody heard of this before? if so care to educate me a little more?