I have a 1988 GTA Trans Am that has stock exhaust all the way back to the muffler which is a knock off cheesy "flowmaster" muffler and I'm trying to upgrade to magnaflow. I'm wondering if I have the right part number: MagnaFlow # 14267. I'm not gonna be able to get over to the car until Wednesday and I'd like to have the muffler by then so my mechanic and I can weld it on. Any help is appreciated, thanks guys. Also, if someone can provide the actual sizes, which I cannot seem to find on google at the moment - that'd be great too.