Perrin Turbo Sump Restrictor. Fix both the burning oil smell and blue exhaust smoke problems associated with your WRX turboback exhaust or Stage 2 and higher WRX by installing the PERRIN Turbo Sump Restrictor. Why you want this: Many customers experience a burning oil problem or blue smoke coming from their exhaust after installing aftermarket J Pipes or turbo back exhaust systems. Installing these parts on 2015+ WRXs causes a change in exhaust pressure, allowing the engine oil
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