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This Remark resonated R1 Spec full-titanium cat-back exhaust fits 2015–2021 Subaru WRX STI and uses a single-exit layout to replace the factory system. The resonator provides a quieter tone compared with non-resonated options while maintaining the reduced weight and finish of a titanium cat-back. It’s a direct-replacement system intended for compatible WRX STI models in the specified years.
Remark 15-21 Subaru WRX STI R1 Spec Cat-Back Exhaust Single Exit - Full Titanium (Resonated)
