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PSi is based in the Motorsports Industrial Park at Sonoma Raceway, (Sears Point) in Sonoma, California. We specialize in Racing Shock Absorbers, Springs, Sway Bars & Goodridge Hoses & Fittings. We are a Factory Authorized Sales and Service Agency for all Ohlins, Koni, Penske, Moton, Bilstein Racing, ZF-Sachs & JRZ shocks. International Orders Information