1997 Nissan Sentra Exhaust Problems

I went in for what I would have imagined to be an exhaust pipe replacement, and the shop told me I would need the
Muffler-$93.71, Elbow Pipe, $96.37 Extension Pipe $ 95.06 and Resinator $116.46 replaced.
This seems like alot to me, am I being an idiot or are all these things truly necessary?

Thanks!