The U.S. is no stranger to seeing Subaru create special-edition WRX STI models that are significantly more potent than what it sells here. Just in the last few years, we saw the W208 and the Type RA-R with over 320 horsepower, compared to the 300 in the standard American STI. That latter one particularly stung, since our Type RA just had 310 horsepower . But what we're not accustomed to seeing is Subaru's home market of Japan being cut out of a special-edition STI, which is exactly the case with the 2018 Subaru WRX STI Diamond Edition.This special STI was developed by Subaru South Africa of all places. And it's a serious machine. It makes a whopping 349 horsepower and 342 pound-feet of torque, which means it's the most powerful WRX STI offered by Subaru to the public. The car also features Brembo brakes with 6-piston calipers up front and 2-piston calipers in the back. The car stands out from regular STIs with its florescent yellow body kit The car was created by Subaru South Africa to celebrate the thirtieth anniversary of Subaru Technica International, the company we all know as STI. Because of that, the Subaru branch is only offering 30 for sale. Prospective customers can register for a chance to have one of the cars at this official website . Also interesting is that this isn't the only ultra-limited edition STI from Subaru South Africa. The company did the same thing for the fifteenth anniversary, and only sold 15 examples of that car. It had a remarkable pun for the name: Subaru Impreza WRX STI STImulating Edition. Really, we're not making that up.