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Subaru WRX S4 STI Sport # is a sharper, limited-edition WRX for Japan only

Depending on your nationality, age, and interests, the first association for the # symbol could be pound — for weight or the telephone, number, plain old hash or hashtag, or sharp for the musically inclined. Subaru Japan intends that last meaning for its new WRX S4 STI Sport #, because this is a sharper version of the mass-produced WRX S4 STI Sport introduced to the top of the range last year. Of note, this vehicle is a standard WRX, not a full-beans WRX STI. The differentiator is the "STI Sport" designation, which has also been applied to the Japan-market Levorg and BRZ, representing a model developed with input from Subaru Tecnica International. Last year's flagship trim picked up STI-tuned Bilstein DTMatic II inverted struts at front, STI-tuned conventional springs and dampers in back, 18-inch black wheels to go with black trim pieces like mirror caps and decklid spoiler, and a special interior with Bordeaux leather and ultra suede. Output from the 2.0-liter four-cylinder Boxer motor was left unchanged from the WRX S4 at 296 horsepower and 295 pound-feet of torque, shifting through the automaker's Sport Lineartonic CVT. The sedan costs 4,093,200 yen ($38,050 U.S.). The limited-edition WRX S4 STI Sport # displays a keener edge thanks to three STI components tested on the division's Nurburgring race cars — a flexible front tower bar, and flexible draw stiffeners for front and rear. All three components have been available on the aftermarket for a while, but their stock fitment is apparently new. The flexible tower bar looks like a typical strut tower reinforcement, but a pillow ball joint in its middle provides vertical elasticity. The bar maintains rigidity across the vehicle, but when the suspension needs a little give to work up and down, the pillow ball joint allows that. The flexible draw stiffeners are adjustable rods that connect a longitudinal frame member to a component on the cross-member, increasing chassis stiffness. STI says the three parts deliver faster steering response, reduced roll speed, and improved wheel tracking in the case of road ruts or crosswinds without compromising suspension suppleness. The Boxer sees some tweaks like a freer-breathing air filter and exhaust that raise torque by up to 10%, and sharpen throttle response. Thicker sound insulation in the floor and extra vibration-damping material in the spare tire well cut road noise for all occupants.

Subaru's STI motorsport arm celebrates 30 years of going fast

The letters W, R and X are often featured on the trunklid of a fast, blue Subaru, but the other important letters for a Subaru are STI – standing for Subaru Tecnica International. The STI motorsport brand brings to mind '90s World Rally Championship victories and Impreza legends such as the wide-bodied 1998 22B, but the division is actually a bit older: STI is celebrating its 30 th anniversary this week. Founded on April 2, 1988, Subaru's STI started out with tuned Legacy sedans. Its first car was a turbocharged Legacy, the RS RA from 1989, available only in a limited 100-unit run of Ceramic White cars, not the 555 Sonic Blue Mica or World Rally Blue that later became almost synonymous with hot Subarus. The RS RA produced 220 horsepower, which was very good for 1989. In January of the same year, three STI-modified Legacy Turbos were used to first break the 50,000 km, then the 100,000 km FIA World Speed Endurance records, with the cars run for 20 consecutive days at Arizona Test Center. The average speed was 138.78 mph, for 447 hours, 44 minutes and 9.887 seconds. That's quite a bit of driving, even in two-hour shifts. The first STI-branded Subaru vehicle was the Japanese-market Legacy STI in 1992, and the Impreza WRX STI followed it two years later. For some time, STI vehicles were the stuff of Gran Turismo gaming for most Subaru enthusiasts, until STI arrived in the United States in 2004. The first U.S.-bound model was the 300-horsepower WRX STI, a Peter Stevens-designed "Blob Eye" facelift of the second-generation Impreza. So far, STI's respectable tally stands at three WRC championships, 47 WRC wins, four Nurburgring endurance wins and a Nordschleife production sedan lap record set last year. Regarding STI's 30th anniversary year's production cars, there will be a limited-edition WRX STI Type RA and a STI-tuned BRZ tS for 2018. View 51 Photos Related Video:

Watch Mark Higgins whomp the Isle of Man TT course in a 2015 WRX STI

Subaru has made another trip to the infamous Isle of Man TT, bringing along its all-new 2015 Subaru WRX STI. The goal? Best the already impressive time set by rally ace Mark Higgins and the 2011 Impreza WRX STI on the same swirling, high-paced ribbon of tarmac. Of course, you already know how that went.
What we didn't know when the story first broke, though, was that Subaru was monitoring data. Specifically, Higgins' data. He was fitted with a monitor that would record his heart rate, breaths, skin temperature and the g forces he was faced with as he lapped the 37-plus-mile road course. While Higgins and Co. were aiming to best their 2011 time (19:56.7), this year's effort also saw a push to beat the time of the sidecar racers.
You can get a recap of the entire event, with plenty of footage and data from Higgins' lap in the exhilarating video below. Take a look.