Four-cylinder engines tend to be the power of choice for economy cars, which makes many believe that they're inherently boring. But those who know understand that a good four banger can be one of the finest engines you can get. They are actually some of the best-sounding things around.

This video of some BMW E30 M3 race cars driving up a hillclimb is a good example. Thanks to the engine's individual throttle bodies, 2.3-liter displacement, and high-strung internals, they all make a fantastic noise as they approach their 8200 rpm redline.

These particular cars are in Group A race trim, which means a stripped out interior, roll cage, and around 300 horsepower going to the rear wheels. The drivers can't help but kick the tail out exiting some of the tighter bends, which results in even more rev-limiter action.

Watch the symphonic E30s attack the hill below, and make sure to turn up the volume.

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