As the STI enthusiast is continually looking for higher performance, APS developed the perfect performance package for the driver chasing performance with stealth.

At last here is a Road and Track "power-up" installation that has been designed and engineered as a complete system by one of Australia's most experienced companies in the field.

The G-Force Stage1 upgrade is optimized specifically for the STI and for the United Kingdom's conditions and fuel octane ratings.

G-Force have transformed Subaru's STI by boosting standard flywheel output from 265bhp to an exhilarating 315 bhp. But that doesn't tell the whole story.  

Significantly enhanced mid range torque and power (at 4,000 RPM an increase from 90 bhp to an outstanding 170 bhp) really transforms the STI into a torque monster with fantastic straight line acceleration - without sacrificing day to day driveability and fuel economy. And at higher engine RPM, the improvement is just as dramatic. At 7,000 RPM power output is increased from a standard power level of 265 bhp to a wicked 315 bhp! - That's 50 more bhp!

At G-Force our commitment to thorough research and development of individual components ensures high engine performance with maximum component durability. Innovative manufacturing techniques guarantees a level of fit and finish rarely seen in after market products.

The APS High Output Exhaust system for the STI for example has set the benchmark for performance exhausts. Careful attention has been paid to exhaust noise and note without compromising outright performance. A strong but subdued exhaust note with no drone at highway cruise and well matched to the dynamics of the STI.

The perfect exhaust for daily driving and truly exhilarating under high speed driving conditions.

All components supplied have been carefully matched and exceed APS's strict performance and reliability criteria. With many kilometers of road and track testing, on APS engineering vehicles ensures maximum performance and component durability.

APS enhanced WRX's and STI's have competed and won many hill climbs, club sprints and road rallies. At APS we have a simple philosophy when it comes to performance. To come first, first you must finish.

Performance is not only measured by quick quarter mile times and high speed. At APS we believe it's as important that you have many years of reliable enjoyment and a car that is always exhilarating to drive.