Question for anybody that knows the answer. Just purchased a edge evolution standard from Nate at Performance truck products but he either didnt ship the 4" mbrp exhaust or its lost at the UPS warehouse up here in MN. I have the CTS all hooked up and tested it out as its awesome. I do have the egt probe up and running as I was wondering if its safe to run lv 2 or lv 3 without the 4" exhaust? Whatcha think?