Subaru of America today revealed the most outrageous WRX STI ever, a custom-built tire destroyer set to star in the next installment of Hoonigan’s Gymkhana video series with Subaru Motorsports USA driver Travis Pastrana at the wheel. Drawing on Subaru’s championship-winning rally and rallycross experience, this one-off STI throws out the rule book with the sole objective of taking Gymkhana to the next level.