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AutoExe Titanium and Muffler Application Mazda RX-8 Part Number: MSE8700 A lightweight and high-rigidity titanium material is used for the silencer shell and the tail pipe. A stainless steel is used in combination for the pipe and the flange. A high-end model where the weight saving and the strength approx. 30% as good as the stainless muffler go hand in hand. Some models have the internal structure of silencer, etc. upgraded. The texture of the high-grade titanium material is the big charm.