What's the best flowmaster muffler to put on my truck?

it's a 2000 ford f-150. i'm just gonna be running a single cat back exhaust so what muffler would be right?|||depends how loud you want it, a flowmaster 40 series sounds nice and the super 40 is a bit louder and the super 44 is the loudest, you can go to the flowmaster website and listen to their mufflers and make your choice.