Chaomomo

Hello All,

I have a w213 E200, planning to get my cat-back exhaust set changed but I am nowhere expert in exhaust system,
currently, I have two option:
1) To change resonator & two mufflers and welds it back with the existing exhaust set.
2) Change the whole cat-back set that comes with both resonator, mufflers and piping.
The point is whether changing the whole cat-back set has any different than just changing the resonator & two mufflers?

Thanks ahead for trying to help me.