first u can have the code removed...second hollow the cat out as itll only cost u a coupling and places like pa just visually look for the cat..they dont test so if its hollow they dont care my power difference wasnt even noticeable when i did mine but i still suggest it so u never have to worry about it. it does make the exhaust raspy and most people dont like that but i prefer the sound...oh and get rid of that crappy resonator while your down there cutting and welding