What's the best way to test the all-new 2015 Subaru WRX STI? We thought putting it in the hands of four-time WRC Champ Tommi Mäkinen might be a good way to prove just how capable, powerful, precise and agile the 2015 Subaru WRX STI is. We think he did a great job putting the WRX STI through its paces. What do you think? 2015 Subaru WRX STI - bit.ly/1ftjmIK