Any changes to my 1994 +8 to improve air flow or exhaust performance really do very little unless the ECU is rechipped. I have the Tornado chip installed and have improved the airflow by creating a cold air ram input behind the front wheel which takes air via tubing to the air box (modified trumpet) and a K&N cone filter. The exhaust is free flowing after the Cat. A noticeable increase in acceleration and performance in the mid range and overall smoother run with increased efficiency.