[tuanle16]

what year did the boxster come out with the exhaust system that has 4 catalytic convertors as opposed to 2? and why? are they interchangeable? ie.. i have a rattle in my rear most right cat of the 4...can i purchase from a boxster that has only 2 cats and replace it? will it fit? how do i plug the oxygen sensor hole?

thanks for any advice.