Short tube headers are the only legal ones in cali. You will notice it I am sure, though you'll still have the restriction of the front cats. To my defense about the the whole low end loss thing... Check out some dyno sheets. You will see losses down low and bigger gains up top... That's just the nature of opening up an exhaust system. Trust me, mine is wide open haha. And you may have power in different places, that I don't know.