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Honda put a lot of effort into making the STOCK exhaust system sound like their F1 car at high revs only. While many supercars (Lambo, Ferrari etc) are referred to as '30 minute cars' because of loud exhausts; Honda designed the NSX to be the quietest at low rpm (for highway cruising) and the loudest at high rpm (for aural enjoyment). My stock system still sounds great 10 years after purchase!