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The three cylinder is their base power plant (excluding the i8) and primarily designed for frugal people who mostly drive in the city or commute to the city, so economy, emissions and noise are high on the priority for the engineers.
Like all engines, you can modify the exhaust system to create a more desirable note by changing the pipes and exhaust components with tuned ones to meet your desire. (this can also increase the power)
I would suggest that you look for an exhaust specialist who can custom a system for you.
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