The Shockwave is a cat-back exhaust, so it will include the Y-pipe. You do not need to purchase the XYZ-Pipe in addition to the Shockwave.
Emissions are not a concern until you decide to remove the catalytic convertors and replace with a set of Test pipes (though you can run High Flow Catalytic Test Pipes $$$).
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'16 Pearl White Sport | Stillen Gen. 3 | Motordyne ART | Motordyne Shockwave | ZSpeed | Powertrix | EVO-R | Aeroworkz | Nismo | Z1 | EcuTek | Tuned by Seb @ SpecialtyZ
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