THIS IS WHAT EJK NOTED TO USERS WHAT TO LOOK FOR?Take note of any bogs, surging, popping, or loss of power. Try to duplicate the problem a couple of times and recognize the steps you are performing to cause the problem. Relate the problem to the general phases of a drive cycle. Are you just cruising, trying to accelerate, or full throttle to feel the power? I have experienced popping and a few times literally stalled in the middle of the street but restarting quickly solved it. Now wanting to really fine tune this device. My Mods includes: Removed backfire screen, WFO airbox and FMF powerbomb & Q4.