You hear it coming before you see it and boy does it have a distinctive sound. The unmistakable rumble of a Subaru flat four ‘boxer’ engine is sure to grab attention whether you’re at a car show or cruising around town. The question is what makes it sound so different from everything else on the road? Let Engineering Explained tackle this question in the video above.
So it all comes down to headers...
The header cylinders in a beefy WRX STI are set at different lengths. With cylinders 1 and 3 being slightly different in length to 2 and 4 any sound has to move in an unconventional manner through the exhaust and produces the unique rumble.
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