Hydrogen engines can give you the best of both worlds, clean emissions and a nice loud exhaust (it's what enthusiasts crave!). So if everything is going electric, does that mean no more exhaust sounds? Not if hydrogen engines become a reality. There's just one big problem: fuel cells exist. They're basically twice as efficient, and storing hydrogen is already a challenge. It takes up a lot of space! With a fuel cell, you need much less hydrogen onboard, because you can use it more efficiently.

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