For what is expected to be the final year of the current-gen WRX, Subaru has introduced the Series.White special edition. This includes a number of performance enhancements, plus Recaro seats and a sunroof delete. Is it enough for the price? We test the 0-60 and push it through the corners to see if it's worth getting -- or if you should wait to see what the 2021 WRX brings.