Bilstein B16 (PSS10) Subaru WRX STi Base/Limited H4 2.5L Front Passenger Replacement - F4-31249522-H1 fits_2007-2018`Nissan`Altima Retains Rear Catalytic Converter: The

Retains Rear Catalytic Converter: The rear cat is retained on this system to maintain a smooth deep sound but more importantly to keep the system street legal

so the black powder-coated airbox keeps that unwanted hot air from entering the air filter

Directly connects to both stock catalytic Converters as well as CORSA Performance RACE SPEC High Flow Cats

The SCORCHER BLUE module is Bluetooth 4

Bilstein B16 (PSS10) Subaru WRX STi Base/Limited H4 2.5L Front Passenger Replacement - F4-31249522-H1 fits_2007-2018`Nissan`Altima Retains Rear Catalytic Converter: TheBilstein B16 (PSS10) Subaru WRX STi Base Limited H4 2. 5L Front Passenger Replacement