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We've had so many posts about how the S55 sounds bad and the N55 sounds great, but I have yet to read the reason why. Any of you folks who are more engine savvy than I am able to explain why the S55 sounds bad? What's different? It cant be the exhaust as changing that out would cure it. Plenty of M3/4 out there with different turbos and the sound is still bad so it cant be that. Is the cylinder firing order different between the two engines? Maybe ignition timing is different?
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