I live in eastern IA and it doesnt have to be sniff tested.. I have already removed the cat...airpump..and blocked the egr..Found that the egr was sticking...i removed it and plated it. That was a major improvement in power and mpg, jus was wondering if I coul d bump up the timing a little like the old carbed engines, I know you will mess up all sorts of issues in a magnum doin this.