New to the forums, but have done plenty of lurking for tips and advice. I just got LTs and custom exhaust with 2 14" Magnaflow mufflers installed. Upon startup, there is a quick/super loud burst of exhaust before the normal idle sound starts. I do have a flex fuel so I know I'm probably running rich. Could this cause what I'm experiencing? I do plan to get tuned soon as well as installing Vibrant UQs.