They'll work fine. However, the STs point out the usual issue of drop springs on these cars : they don't go high enough in rate!
Increasing the front spring rate to 650-750 lbs/in makes a noticable difference in handling, while NOT influencing the ride all that much!
On the other hand, even small (i.e. 10%) changes in REAR spring rate do noticably affect ride quality. With the ST rear springs (270 lb/in vs stock 160 lb/in rate), expect the ride to get considerably stiffer. Also expect it to become more difficult to get the car to hook up off the line. Unfortunately, with drop springs in back you're pretty much stuck with the higher rates to avoid bottoming out the suspension even if the rates aren't ideal from a ride or handling standpoint.