Performance increase if any would be marginal. In order to show real performance increase, you would need headers, and a true dual catback exhaust from one end to the other. And then, you would need to open up the air intake system, by finding a location to add a second air box and the necessary Y piping. The 300Z had a dual head Jim Wolf to increase airflow directly replacing the stock air box, but there ain't much room in the MO. And then, the ECU would need to be reprogrammed in order to take advantage of the better flowing capacity of the system. Then, a dyno run would probably show some interesting numbers. Otherwise, why bother for 5 HPs over 245? I mean, what does a 2% improvement show in a dyno run?