ditch the cat if you can (high flow/straight pipe). It's too bad you replaced your filter with the $50 k&n one already, the cone filter woulda helped better, then you could try it in different places trying to get the best mileage for the power air (cold air is more dense and will cause more fuel to be required) also don't forget your o2 sensors. Better spark plugs (cap/rotor if you have them) lighter smaller tires for around town. lighter bigger tires for highway(just make sure to compensate when you look at your speedometer smaller means you can speed a tiny bit, bigger means you must slow down some) either way make sure the rim is lighter. Better flowing exhaust manifold / header wrap (keeping the heat in the header or down the pipe keeps air flow speed higher thus less restriction. also when changing your fluids don't for get your differential. If you don't use a/c remove the v-belt (or bypass with a serpentine belt) same with smog pump (if you can ditch your cat) for non big trucks, ditch the power steering (trust me in 2 weeks *exact with my wife and her 280* you will have built the muscles to not notice it being gone) or other un needed belts. Switch from a clutch fan to an e-fan if you don't already have one.
also
lightened flywheel/flexplate
you could get a carbon fiber or even aluminum driveshaft
lighter hood (aluminum / carbon fiber)
lucas products are the best! Also change your fuel filter again soon. The FI cleaner will knock all the grime into it and plug your new one up since you didn't run it through a tank or two first then change the filter.
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