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Discussion Starter #2
Could be two things:

ECU programming (1)and The actual exhuast from cat-back (2) are set to have better emission control here in the U.S. this causes more restriction, hence less horsepower at higher parts of the powerband.
 

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Discussion Starter #4
Re: Could be two things:

The EU has become remarkably stringent on emissions. For example here in the UK, owners of cars with higher pollutant output such as the E55 are heavily penalised via a significantly increased tax.<br> <br> We also have strict regulations on noise, which means cars deemed as 'loud', for example the Toyota Supra and Ford Cosworth, are no longer sold here. In this respect the Euro version of the Benz is just as much trouble from a regulatory point of view as the US version.<br> <br> That said, I could well believe that your E55 is built to meet Uncle Sam's most stringent requirements, thus making the car able to pass any test in the land. So in all probability you have California to thank for the power drop :)<br> <br> Jamie.
 

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Discussion Starter #5
And stricter they are...

Not only is this true for Mercedes but with BMW and Audi as well. Worst case scenario is that they totally ban a model from ever reaching U.S. shores due to failure of Federal emission tests.
 

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Discussion Starter #6
But . . .

According to stats published last year, the Chrysler Grand Voyager 3.3LE scores worse on the UK's Environmental Pollution Index, ranking 84 out of all 84 cars tested. There was a furore at the time because the British Prime Minister drives one :8)<br> <br> In GreenerCars.com's list of the twelve 'Meanest Vehicles for the Environment', pretty much every model listed is American. In the list of 'Greenest', all bar one are Japanese.<br> <br> So I'm not quite sure (a) how US cars manage to pass their own tests, especially if they are as strict as you claim, or (b) how find their way to European shores without anyone batting an eyelid. It's made all the more strange by the fact that (you say) cleaner European models may not be allowed to be sold in the US...<br> <br> Jamie.
 
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