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The GReddy Supreme SP 63.5mm cat‑back exhaust for 2006–2011 Honda Civic Si is a GReddy cat‑back system sized at 63.5mm intended as a direct replacement from the catalytic converter rearward for those Civic Si model years. As a cat‑back it serves to update the exhaust path and is offered to change the vehicle's exhaust characteristics while fitting the specified Civic Si applications.
GReddy 06-11 Honda Civic Si 63.5mm Supreme SP Cat-Back Exhaust
