I have an 06 GT I recently installed a set of forty series flow-masters which I wasn't to impressed with ,so when my local shop told me that they had an off road X pipe without cats in stock I jumped all over it ,but after installing it even though the power and torque felt a lot better ,the car sounds like it should be on the set of the fast and the furious (joke ) just really raspy, high pitched ,tinny ,and not the typical deep rumble that mustangs are know for ,did I do something wrong? or is this how all 4.6 sound ?