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The 2019 Subaru STI S209 has an intercooler sprayer, here's what it looks like when you activate it

The 2019 Subaru STI S209 gets a lot of features that distinguish it from your average WRX STI including wide body work, a giant wing, additional chassis braces and an extra 31 horsepower. It also brings back a performance gizmo that hasn't been featured in a U.S. market Subaru since 2007: the intercooler sprayer. As the name implies, it sprays cool water onto the air-to-air intercooler when pressing a button. In the case of the S209, that button is one of the paddles on the back of the steering wheel. That triggers the water nozzles hidden in the hood scoop to spray water. You can see what happens in the video below. Note that when the car is in motion, air would carry the spray farther back covering more of the intercooler. Now why would you want an intercooler sprayer? Well, the S209, like all WRX and STI models, uses an air-to-air intercooler to cool off hot air coming from the turbocharger on its way to the intake manifold. The cooler your air, the denser it is, meaning more oxygen to combine with fuel to turn into more power. The effectiveness of the intercooler depends partly on the temperature of the outside air flowing over the intercooler. If it's really hot out, it's not as effective. So spraying water onto the intercooler can counter this to ensure that the car is making maximum horsepower even in toasty conditions. This also means that although this may feel like some special secret performance-boosting weapon, it's really only effective in specific circumstances, and will just get you back to normal power, rather than make the car noticeably faster on the street. Long track days in the summer and after waiting in line at the drag strip or autocross are the kinds of situations where you could see power diminish due to hot air and a lack of moving air. Normal driving won't necessitate its use nor will driving in cool temperatures. In fact, the S209's owner's manual specifically says not to use the sprayer in temperatures below 41 degrees Fahrenheit because of the risk of frozen water in the tank. That brings us to another aspect of the intercooler sprayer: maintenance. In fairness, there isn't much to maintain, but if you want to use the system, you do need to keep the tank filled. It's located in the trunk where the spare tire would normally be. Inside of course is a water pump that connects to hoses that run water to the front. There is a warning light that will illuminate on the instrument panel if it runs low.

Subaru WRX STI Diamond Edition is the most powerful ever offered

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. Related Video:

Subaru PHEV possible next year, pure EV in 2021

Despite what its larger competitors are doing, Subaru has avoided the draw to create its own electric vehicle. Tighter emissions regulations around the globe, though, have the company reconsidering its options. The company is pouring a record amount of money into research and development, according to a report from Bloomberg, and that includes EV technology. Also, Subaru could introduce a plug-in hybrid as early as next year, and an all-electric vehicle by 2021. Subaru CEO Yasuyuki Yoshinaga tells Bloomberg that the company doesn't need a dedicated platform for battery-powered cars, and will likely put plugs into existing models. This way, the automaker doesn't have to partner with another company beyond finding a supplier for the motor and battery, and can extract the full value out of its current nameplates. A previous report suggests that Subaru would electrify the Outback or the Forester, but Yoshinaga doesn't confirm this in his interview with Bloomberg. Instead he uses a model that recently ditched its hybrid version in a hypothetical example: "If there's already an attractive Subaru model, for example the XV crossover, and if a customer in Beijing wants one but is only allowed to buy an electric vehicle, if there's no electric version then he can't buy it. Providing the choice of an EV means the customer can still desire the same Subaru." As for sourcing the battery, Yoshinaga says that a decision would have to come in about a year, and Panasonic and Samsung are possibilities. In addition to EVs, Subaru will use some of its $1.2 billion in funds set aside for R&D for the year ending in March, 2018 on driver assist technology, autonomous driving, and connected vehicles. Related Video: