Right now I am driving a 1996 Pontiac Firebird Formula Coupe. It has the WS6 package but no ram air. A few weeks ago I put it on the dyno and got about 317-321 hp. I am looking for ways to increas gas mileage as well as HorsePower. Modifications include performance pulleys/belts,K&N intake, Flowmaster exhaust system and various other small tweaks. Any suggestions would be greatly apreciated on how to increase my gas mileage. As of now I am getting roughly 13-15 city and 20-22 highway.