For a stock engine, go with 2 1/4" duals. As for the mufflers, it just depends on how loud you want it. Dynomax Super Turbo mufflers have a deep throaty sound that sounds nice but isn't too much louder than stock. Magnaflows are straight-through and louder than the turbo mufflers but still have a deep performance sound. On the louder end is the 40 series Flowmasters. Pick your poison.
