Have you considered bigger air cleaners for more airflow?
What's there is already an upgrade over stock. The stock air cleaner has a reusable metal mesh filter:
It is 8 inches in diameter and 1 inch tall. Some arithmetic yields an inlet surface area of 25.1 square inches.
The Eddie Edmunds repros are 4 inches in diameter and the filter is 1-5/8 inches tall - that's 20.4 square inches. With two inlets that's almost 41 square inches of surface area - a 62% increase over stock.
