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I'm pleased with the sound of the M5 mufflers on my 550i...not too loud but just enough to remind me that's there's a nice V8 under the hood. Even so, I'd still be very interested in how a modded 550i muffler sounds...maybe like some Akaprovics?
Last edited by HDEddie1; 09-13-2014 at 12:22 AM..
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