well you will need the header gasket that connects to the head

and you will need a doughnut gasket that connects the flandges, and im sure you can find a way to get the stock cat to work, or find an aftermarket one that you can use. then i believe 2 more, for the cat to the piping, and then one more for when you put the rest on. unless its just the header..

so if that, just straight pipe if from the cat, back. and if its to loud, keep the resinator and pipe it from there