Types of mufflers

You can go stock. Don't buy stock mufflers from a dealership as they are genrally made by an aftermarket company and can be purchased at an auto parts store. If you want a different tone that will increase power some and not be loud, check into the Apexi Noir muffler.
Www. Carrepairlinks. Com is a good place to look as they have several reputable retailers and you can get exclusive discounts on part when ordered through the ad banners on the site.