The short and sweet of it is that this muffler, like all our mufflers, went through a rigorous development period where we ironed out some odd sounds that this engine can make when uncorked. Our secret is a straight through design passing inside chambered areas and branching into a balance pipe. This design really smoothed out the random pops, burbles, and raspiness and produces a very sweet and full-bodied voice. We were also careful not to compromise power output gain with this fine tuning, and despite the extra sound control, maximum power gains obtained were +11hp and +8lb-ft of torque at the crank. This is power you can really feel, and countless Cayman owners report undeniable acceleration improvements after installing this kit. Our exhaust systems are handbuilt works of art, aka what your Porsche deserves.