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Are they worth the extra expense?



That depends on what you want from the car. I like to go around corners as fast as possible. The after market strut rods get rid of the factory rubber bushings and replaces them with heim joints. Removing the rubber prevents the suspension geometry change that happens with hard braking. Unless you brake very hard comming into corners with modern tires you will never know the difference imo. I've seen people spend mega $$ on their suspension and brakes only to loose most all of the benefits by going with old school 15" tires.