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FWIW I have the Fabspeed Sport headers with catalysts, Circuit Werks mid pipes without catalysts, just small silencers in their place, and the stock U pipes and muffler on my 2003 S which was rebuilt as a 3.6 and has a custom Softronic tune. I have the stock O2 sensors, not those special sensors designed to trick the ECU. My car passed the NJ State inspection at a State DMV inspection center, where the only things done are to see that your check engine light is off and hook up their OBD system to your car and make sure it isn't throwing any codes.
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Current: 2022 718 Cayman GT4, PDK bone stock (the dark side).
Former: 2003 S, 3.6 LN Nickies, ARP rod bolts, under-drive pulley, Fabspeed sport headers, Softronic tune, 987 airbox 987 motor mount, Function-First Sport motor mount insert, Ben's short shifter, Nine8Six projector headlights & center caps, ROW M030, stainless flexible brake lines, B-K rollbar extension & fire extinguisher mount, hardtop
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