High Performance Beds Canape Ways To Boost Up My Engine?

Ways to boost up my engine? - high performance beds canape

I have a 94 'Ram 1500 V8 with a Magnum. I'm on the lookout for ways to remove, petrol in the tank without increasing the view from my car. In other words, the bed, tailgate, etc. I have a K & N air filter, now 8 Spitfire high performance triple platinum spark plugs, or a group A dual Flowmaster exhaust and an entry d get cold air. Has anyone other suggestions for more mileage? Thanks in advance
Blake