I thought i might throw this one out see if anyone knows. My friend has an '01 PT Cruiser with an automatic. He has headers, a cone filter w/ a box, screamin demon coil pack and wires, and a dual glasspacks out the back. Now if he runs a dump behind a high flow cat, will he be getting enough backpressure? How about no cat? The PT Forums that he is on doesn't have very many people with much techinical knowledge about the car. I told him that if he ran the highflow cat and dump hed probably be pushing it, but im not too sure. Any ideas welcome!