Custom Builds
Introducing the 2015 Subaru WRX—an exhilarating ride that prompted us to push its limits through rigorous testing. In its stock form, the WRX showcased its prowess, delivering 197.7 whp and 228 ft-lb tq. A closer look revealed an erratic boost curve, hinting at untapped potential. Enter the COBB Stage 1 tune, transforming the driving experience with 223.0 whp and 249 ft-lb. Yet, we couldn't resist fine-tuning it further. The PREracing Custom Stage 1 Tune pushed the boundaries, extracting an additional 7.6 whp and 257 ft-lb, enhancing torque delivery and overall performance.
Eager to unleash these modifications on the racetrack, we embarked on back-to-back comparisons. The results were clear—the COBB Stage 1 tune boosted performance, but the PREracing Custom Tune stole the spotlight, clocking the fastest elapsed time and highest MPH of the day. However, challenges surfaced, indicating the need for better fuel quality and addressing high back pressure. Stay tuned for our upcoming tests, where we explore the gains of transitioning to ethanol-based fuels, unlocking the WRX's true potential.