I recently purchased a 2010 Pilot..... threw a code the very next day ! PO303 - cylinder 3 misfire. Seems the VCM is possibly related to the misfiring. I’m reading a lot now about the Muzzler, VCM, and S-VCM Controller, and all the various details. One of my questions is : How difficult is it to tell if either of these two after market devices have already been installed, for a visual, where would I look ? Second question is, How would a VCM, Muzzler or Controller, affect the engine while towing ? Thanks !