Larger Diameter Catalyst-Back Exhaust

Advantages: More efficient high-speed engine operation

Trade-offs: More noise, potentially.

High-tech advances in exhaust design mean that opening up your pipes doesn’t have to be noisier—that’s what APR’s “Reflective Sound Cancellation” system promises. It doesn’t promise to be cheap, however. A catalyst-back RSC system for an Audi S4, for example, runs $1169.

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