This 524hp Subaru Impreza WRX STi hits the dyno with equal length headers and a screamer pipe, unleashing the full voice of its EJ25 engine. Expect aggressive pulls, turbo spool, and raw boxer engine ...

The Subaru Impreza STi producing over 500HP, captured on the dyno with a screamer pipe setup. Featuring the EJ25 engine’s signature turbo noises, flames, and pure boxer sound during dyno pulls. GOP ...