Subaru WRX STI 340R: Ultimate Performance Review

The Subaru WRX STI 340R stands as a pinnacle of rally-bred engineering, blending ferocious power with all-wheel-drive precision. Launched as a special upgrade package, this model elevated the standard STI’s capabilities, delivering 335 horsepower and blistering acceleration for enthusiasts seeking uncompromised performance.

Engineering the Power Surge

At the heart of the 340R lies a turbocharged 2.5-liter flat-four engine, renowned for its distinctive boxer rumble and high-revving character. The upgrade package transformed the base 296bhp output into a staggering 335bhp at 5,400rpm, accompanied by torque surging to 361lb ft at 3,600rpm. These gains stemmed from precise ECU remapping and a freer-flowing exhaust system, allowing the engine to breathe more efficiently without major hardware overhauls.

This power hike shaved the 0-62mph sprint to 4.7 seconds, a full half-second quicker than the standard STI, while top speed hit an electronically limited 158mph. The result? A car that propels forward with explosive urgency, ideal for overtaking or track days, yet remains street-legal and compliant with high-octane fuel requirements.

Chassis Dynamics and Handling Mastery

Subaru’s symmetrical all-wheel-drive system, paired with a driver-controllable center differential, defines the 340R’s cornering prowess. The upgraded model retains the STI’s stiffened suspension, Brembo brakes, and wide-track stance, ensuring phenomenal grip on twisty roads or slippery surfaces. Reviewers noted its ability to rotate precisely under power, rewarding skilled drivers with neutral balance and minimal understeer.

On public roads, the 340R’s DCCD (Driver Controlled Center Differential) allows real-time torque vectoring between axles, mimicking the agility of rear-drive rivals while providing superior traction in all conditions. This setup shone in wet-weather tests, where lesser cars would falter, making it a year-round performer.

Interior Comfort Meets Rally Spirit

Step inside, and the cabin exudes purposeful simplicity. Recaro sport seats hug the driver during hard cornering, while Alcantara-trimmed steering wheel and alloy pedals enhance the connection. The digital instrument cluster displays boost pressure and turbo stats, feeding the driver’s adrenaline.

Despite its track focus, practicality persists: a 460-liter boot swallows weekend gear, and four doors accommodate passengers comfortably. Infotainment, though basic by modern standards, includes Bluetooth and a six-speaker audio system, prioritizing driving over distractions.

Performance Specifications at a Glance

This table highlights why the 340R punched above its weight, offering supercar pace in a sub-£30k package.

Pricing and Market Positioning

In 2012, the base WRX STI dropped to £26,995, with the 340R upgrade adding just £1,599, totaling under £29,000. This undercut many hot hatches while surpassing their power and drivetrain sophistication. As Subaru phased out UK imports due to shifting demand, the 340R became a swan song, amplifying the STI’s legacy with extra potency.

Today, well-maintained examples command premium prices among collectors, their limited production and upgrade exclusivity driving values skyward. Compared to contemporaries like the Mitsubishi Lancer Evo or Ford Focus RS, the 340R’s boxer engine and AWD tuning offered a unique rally heritage.

Real-World Driving Impressions

Behind the wheel, the 340R delivers a visceral experience. The turbo spools with a whoosh, followed by a surge that pins occupants back, accompanied by a raspy exhaust note. Gearshifts through the precise six-speed manual are mechanical poetry, ratios perfectly spaced for road and track.

Handling tests revealed its poise: on winding B-roads, it dances with playful tail-out slides under throttle modulation, yet snaps straight under braking thanks to massive ventilated discs. Fuel thirst—around 25mpg—reflects its performance focus, demanding premium unleaded for peak output.

Strengths and Potential Drawbacks

• Explosive Acceleration: 335bhp catapults it ahead of rivals.
• Grip Monster: AWD conquers corners and conditions.
• Engaging Manual: Pure driver involvement.
• Value Proposition: Massive power for hot hatch money.
• Rally Pedigree: Built on World Rally Championship DNA.

Challenges include a firm ride over rough surfaces, high insurance groups, and maintenance costs for the turbo setup. Still, for enthusiasts, these are badges of authenticity.

Upgrades and Modifications Ecosystem

The 340R’s PRO-R package, applied post-factory by Subaru UK, echoed Prodrive’s legendary tuning. Enthusiasts often add intercoolers, suspension bushes, or lightweight wheels, but the stock tune suffices for most. Forums buzz with tales of dyno-proven gains, though warranty considerations applied originally.

Legacy in Modern Performance Cars

The 340R encapsulated Subaru’s defiance of downsizing trends, prioritizing raw power over efficiency. Its discontinuation marked the end of an era, but echoes persist in newer WRX models. As electric performance rises, this fossil-fueled firecracker reminds us of analog thrills.

Frequently Asked Questions (FAQs)

What is the Subaru WRX STI 340R upgrade?

The 340R is a performance pack boosting power to 335bhp via ECU tweaks and exhaust changes, available for £1,599 on 2012 STIs.

How fast is the 0-62mph time?

Claimed at 4.7 seconds, verified in independent tests as brutally quick.

Does it require special fuel?

Yes, high-octane petrol (98 RON) is mandatory post-upgrade for optimal performance.

Is the 340R rare?

Limited UK run makes it collectible, with fewer than standard STIs produced.

What’s the transmission like?

A slick six-speed manual with rev-matching aids, beloved by purists.

Buying Guide for Enthusiasts

Seek low-mileage examples with service history; check for upgrade authenticity via Subaru stamps. Budget for cambelt intervals every 105,000 miles. Post-purchase, enjoy track days—the 340R thrives there.