I know there's been a lot of threads regarding the pros and cons of different exhaust systems. I just ordered Tubi's for my 2000, 550 Maranello. Should have them in a week or so.... bought them new from HG Parts, near Stuttgart, Germany. They sell new pairs for about $ 1,000 less than any place I found in the US. Paid $ 2,199 US plus $200 for express Fed Ex shipping, and of course no tax. I'm aware of the resonance issue with some Tubi's but have faith (fingers crossed) this only applied to the earlier 550's. There doesn't appear to be much of a concenus on this forum one way or the other, seems some people love them, the others have issues... sort of 50/50. I'll post a new message in a couple of weeks when I get them on the car .... and let everyone know what I think of the tone, sound levels and resonance issue... at least as this applies to a year 2000 Maranello. One thing for certain ...... the stock exhaust is way too subdued .... I've had the car only two weeks ... and changing the exhaust is priority # 1.