All I am looking for is the correct part # for a Magnaflow Muffler. That's all I want is just a Muffler. I don't want a cat-back or exit pipe and tip. All I want is a Muffle that I can take to my shop and have them take down the OEM and install the Magnaflow. Am I right that I need 2 1/4 in and a 2 1/2 out? H E L P !