I dont know what muffler to buy!

[robertp11]

I have a 2003 Tahoe and recently had dual exhaust put on it with a flowmaster 50 series muffler. I thought it was too loud for my daily highway commute so I put the factory muffler back on but keeping the dual pipes out the back. Does anyone know of a good muffler that is reasonably quite (more quite than a flowmaster 70series) but still allows for single in and dual out. I would appreciate any help you all can give me. I will have pics of my Tahoe and the current exhaust on here soon.