2020 Subaru WRX STI, new WRX STI, Subie rumble
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Subaru WRX STI Rumble Is Music To Your Ears Video

What is the iconic Subie rumble? It can be music to your ears if you are a Subaru WRX STI fan.
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Subie rumble is more than just loud exhaust pipes and making your neighbor’s windows rattle when you leave your house. It can be music to your ears if you are a Subaru WRX STI performance enthusiast. STI owners work hard at getting a louder Subie rumble you hear when a 2.5-liter Boxer flat-4 engine with a modified exhaust is heading your way.

What gives the Subaru WRX STI its iconic boxer exhaust rumble? Jason Fenske of Engineering Explained says the reason the WRX STI sounds so unique is due to the unequal length headers in the 2.5-liter Boxer flat-four. It’s a love affair with WRX/STI owners who won’t be letting go of the iconic sound anytime soon. It’s part of the Subie culture.


Subie culture at Hyper Meet

The sound is unique because the exhaust pulses do not line up evenly before entering a single exhaust pipe to exit the rear of the performance car. The uneven exhaust pulses result in a “fluttering sound” rather than a smooth even exhaust note which is characteristic of equal-length exhaust headers.

Subaru Tecnica International is taking the new STI S209 and giving it the Subie rumble right from the factory. They have included engine upgrades including a high-flow intake system featuring a new intake duct, induction box with conical air filter, silicone turbo inlet duct and, a nod from the 2004-07 WRX STI, an intercooler water spray system that lowers intercooler temperature via manually operated steering-wheel paddles.


STI S209

The S209 also receives a new high-flow fuel pump, larger fuel injectors, and an STI-tuned engine control module. To get the iconic rumble the performance division of Subaru has included high-performance mufflers delivering 17-percent less airflow resistance while larger hand-polished stainless-steel 101mm diameter exhaust tips finish out the sweet exhaust note.

The Subaru WRX STI is the only vehicle on the road that has this iconic Subie rumble and Subaru Tecnica International (STI), Subaru’s motorsports partner, is proud of it. They recently put out a video of the Impreza, WRX STI S208, Levorg STI sports tourer, and BRZ exhaust set to music. It is music to your ears if you are a Subaru WRX STI performance enthusiast.

You Might Also Like: 2020 Subaru STI Updates, Why You Should Wait For The All-New 2021 Model Change

Watch and listen to the STI Music video.

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Photo credit: STI, Subaru USA, Subaru Canada


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Comments

Have your neighbors complained about your Subie rumble?
I didn't hear any unequal length headers in that video even though that's what the article was about. You might wanna fix that. I'm not a fan of them anyways since they are so inefficient. I replaced them with equal length headers on my current 2015 STI shortly after I got it.