By far the best mod for the money for the 08/09 STI! There is a dramatic improvement in the handling over the stock springs in all conditions; cornering, braking, acceleration, and high speed maneuvers. Understeer and body roll are significantly reduced. This is such a perfect design as a stock spring replacement, that Subaru should have used Racecomp to OEM these for the STI. "This is how the car should have come from the factory"