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BMW M3: two banks of cylinders, two pipes for a while combine into one muffler, 4 tips
Lexus IF: two banks of cylinders, sometimes two pipes, sometimes one, two mufflers, 4 tips.
Conclusion: They're both faking it, but it's no surprise since they're both mass-market production cars.
FWIW, the Lexus appears to have some underbody aero cladding, whereas the BMW definitely has none.
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