Brembo 04-17 WRX STi Front GT BBK 4 Piston Cast 2pc 355x32 2pc Rotor Drilled-Silver turn14-oos 5" diameter system features Borla(r)'s

5" diameter system features Borla(r)'s Polyphonic Harmonizer Technology which utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean

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Improves response and sound

Brembo 04-17 WRX STi Front GT BBK 4 Piston Cast 2pc 355x32 2pc Rotor Drilled-Silver turn14-oos 5" diameter system features Borla(r)'sManufacturer Part # : 1B1. 8048A3 Product Description Short Brembo 04 17 WRX STi Front GT BBK 4 Piston Cast 2pc 355x32 2pc Rotor Drilled Silver