OK dumb question time. I'm looking to purchase my first phase of modification. Intake and exhaust. Illinois does not have emission testing and the price for same parts is quite a bit cheaper. Other than the cost difference, am I getting anymore performance by using them and would you use carb legal or not? Also, can I use say..illegal intake and match it up with legal exhaust to save a little cash? Reason, may move some day to a state with emission testing and intake replacement is the cheaper part to change out. BTW looking at Roadster sport mid pipe and muffler and HPS intake which is not carb legal.