I'm wanting to get a new exhaust for my camry. I'm new to cars and want to learn. If I buy an exhaust do I need to buy one or two? I have a pipe on each side but don't know if it's connected to the same exhaust. Also, when I do get the exhaust will It be easy to put on? I was thinking of getting the magnaflow race series 14851. If you have any better exhaust types let me know thanks.