Hey, have any of you ever had your car backfire. Mine does, at certain times, such as when I just stomp on it. It sounds like it comes from under the car or at back of car ,possibly at mufflers. I have checked for codes with my SCT, but none are shown. I recently installed a VMP tuning 2.3 supercharger, along with a boost-a-pump. Justin Starkey at VMP tuning wrote me a custom tune for the setup along with all of my other mods. Any ideas?