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