For the best sound control and exhaust flow I like the Dynomax super turbo. Magna Flow, Borla and Dynomax ultra flow are good mufflers also and will perform as good or better than the Dynomax but they are through type design and typically not as quiet. Borla, Magna Flow and Ultra Flow are stainless steel so they will outlast the super turbo. If you're concerned about performance stay away from the flowmaster or what I like to call them flow-disaster.