Anything that increases airflow in or out of the engine will help. Also reducing parasitic losses. Switch to electric fan. High flow exhaust. With the 2.5 installing the larger throttle body from a 4.0 increases airflow. An oilpan with a scraper and windage baffles can help(mostly high rpm for this one). Make sure you don't have a brake dragging. As an added bonus this all means more power. Especially for the anemic 2.5.