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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 and STI meet at the dyno with interesting results

Road and Track recently put the 2015 Subaru WRX and the 2015 WRX STI through a battery of dyno tests to find out not only how much difference there is between their two engines, but what kind of differences there are. The WRX gets the company's new FA20 2.0-liter boxer four-cylinder engine with features like a twin-scroll turbocharger, direct injection and variable valve timing on its two cams. The WRX STI stands pat with the older EJ-Series motor, meaning a 2.5-liter boxer four-cylinder with port fuel injection and carryover turbo lag. Subaru pegs the $26,295 WRX at 268 horsepower, 258 pound-feet of torque and an "extremely conservative" 0-60 mile per hour time of 5.4 seconds. The $34,495 STI clocks in at 305 hp and 290 lb-ft with a 0-60 mph time of 5.1 seconds. Ok, fight.
R&T's dyno runs sussed power numbers at the wheel of 223 hp and 245 lb-ft for the WRX, 247 hp and 243 lb-ft for the STI, then went on to demonstrate in numbers what everyone knew: that the WRX consistently puts out more of its torque earlier than the STI and achieves full boost almost three seconds quicker. On the other hand, on the track, the STI was also shown to have a conservative official 0-60 mph time, stopping the timer at 4.8 seconds compared to the WRX's 5.2 seconds.
The mag says it has comprehensive results coming from its "complete battery of tests," but for now, you can scrutinize their dyno charts and let the battle continue about which one you'd rather put your money down for.

Subaru WRX vs. Volkswagen GTI | Under-$30K fun

If financing a new car purchase for 60 months, you'll spend roughly $200/month for those five years on every $10K you finance. Subaru's WRX and Volkswagen's GTI, each with a base price of around $25K (which equates to roughly $400/month with 20 percent down) can easily become $40K (in WRX STI and Golf R trim). That extra $15,000 will cost you almost $300/month over the life of a 60-month payment book. A $40K Subaru or Volkswagen is cheap in terms of enjoying the additional performance, but if your goal is only to get places in a fast hatch or sedan, you can keep your outlay far closer to the base price. Just mind the options. VW GTI: In the increasingly popular hot hatch segment, the GTI was arguably the first. Based on the revolutionary (for the mid-'70s) Golf hatchback, the GTI offered upgraded power, improved handling and just enough cosmetic enhancements to let others know you were driving something special. Consumer response was immediate, and imitators came out of the woodwork. Now in its seventh iteration (as of the 2015 model year), the GTI has consistently evolved. Its 2.0-liter turbocharged four makes 210 horsepower and — more important in day-to-day driving — 258 pound-feet of torque. Its footprint remains comfortably small, with easy access to front and rear seats and, if you need to carry something large, it has an expansive hatch and fold-down rear seat. Like most of the VW/Audi family, its interior design and appointment bat well above the $25,000 price point. Whether selecting the six-speed manual transmission or six-speed DSG automatic, know that a responsive, agile hatchback is just a throttle tip-in away. It's perfect for the in-town commute, weekend getaway or cross-country romp. And it appeals to a wide demographic, so resale value will remain high. Subaru WRX: This once was a performance derivative not shared with American consumers. But with its success globally, Subaru brought the WRX to the States, with the high-performance STI variant not long after. Having been offered in the U.S. as a sedan, wagon and hatchback, today's WRX is available only as a four-door sedan. As on every Subaru available in the U.S. (except the BRZ), all-wheel drive is standard. Power is supplied by a turbocharged flat four displacing 2.0 liters but upping the horsepower to 268, while available torque is numerically identical to the GTI's at 258 pound-feet.