X-pipe to delete factory center rear muffler on 2009 Porsche 997S with 3.8l DFI engine. Also works on 997 non-S model. Factory muffler consists of a u-bend on each side inside a can with a shared void space. The u-bends are not optimal for making power, but the void space between them that they bleed sound into takes the edge off the engine tone. Our X-pipe really sweetens up the tone of this engine, while also sounding a bit louder and more aggressive. Unfortunately, this component does lose some power t

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