PLM Power Driven 3" Non Resonated Mid Pipe Subaru WRX STi 2015 - 2021PLM Private Label Mfg. Power Driven 3" Non Resonated Midpipe Kit for Subaru WRX STI 3" 2015 2021 was made for maximizing HP gains, more flow, more power, more torque & more sound! Precision CNC mandrel bend tubing allows for a constant tubing diameter throughout the bend, which results in precise fitment as well as improved exhaust gas flow. Each system is fitted with a straight pipe to eliminate the resonator, includes stainless steel flanges, and