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Motor Trend pits Subaru WRX vs. Ford Focus ST

The Ford Focus ST has enjoyed a relatively calm, if brief, reign in the world of hot hatches. With nothing else in the class (in the States, at least) but the aging Mazdaspeed3 and Subaru Impreza WRX and the slow-selling Volkswagen Golf R, the Blue Oval's 252-horsepower five door has been the go-to vehicle for those that don't need the high-octane lunacy (and expense) of the rally bred Subaru Impreza WRX STI and Mitsubishi Lancer Evolution X.
Now, though, as the new Subaru WRX (it's not an Impreza anymore, though, neither is it a hatchback...) starts to arrive at dealers, the Focus ST appears to be under threat for the first time. Naturally, Motor Trend is here to figure out which one is the best, with another one of its Head 2 Head videos. Host Jonny Lieberman puts both cars through their paces, going above and beyond, quite literally, at the very end of the video.
Have a look below and let us know what you think of MT's verdict in Comments.

Subaru BRZ with 362-hp, 2.4-liter V8 is the best thing you'll hear today

Whenever the Subaru BRZ and its Toyota twin are talked about, the conversation inevitably turns to whether they would be even better sports coupes with more power. Since their introduction, rumors have popped up suggesting possibilities like more displacement, turbocharging or even a hybrid setup to increase horsepower, but nothing has come to pass. Japanese tuner Jun Auto has decided on a completely different way to boost performance by chucking the 2.0-liter boxer four-cylinder entirely in place of a beautiful 2.4-liter V8. According to the YouTube description for this clip, the engine is based on two of the 1.2-liter inline four-cylinder units from a Kawasaki Ninja ZX-12R motorcycle. The result is a mill that makes a claimed 362 horsepower and revs to over 11,000 rpm. It also sounds like automotive nirvana. Finished in an eye-catching contrast of bright yellow paint with white wheels and a black wing at the back, the V8 BRZ certainly doesn't hide its performance, either. This video's text is in Japanese, but knowledge of the language isn't necessary to understand what's going on.

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.