Need help on information regarding my 2010 toyota corolla and replacing stock exhaust!?

you cannot modify your car in any way. anything you do to the body or engine including exhaust will void the warranty. There is a reason for this. manufacturer does not expect people to do all the routine maintenance required. So do all the oil changes, and routine maintenance make sure the car gets tuned up like it is supposed to. They look for exduses not to honor warranty. cheer up, the exhaust will be brand new when you get to put it on, and at least the new muffler you have will have a lot more wear on it.