Which muffler?

[ILLaViTaR]

My rear muffler is corroded and I was wondering what I should replace it with?

Do better quality mufflers provide better fuel economy?

I'm rather fuel economy than performance so which muffler should I look into?

Also I don't wanna spend a lot, I think the stock one is $70, i'd like to spend no more than $130 on it.

Also I don't care about sound.

Economy is all I'm concerned about, A bit more power could be nice but as long as it doesnt effect economy.