Its now called the 370Z because they used to have 3.5L Engine for the 350Z and now they made a 3.7L which is why they call it 370Z. The 370Z has 18 More HP than the 350Z which is 338HP.
For the 2003-2006 model, it is 287HP. 0-60mph in 5.5 seconds for manual transmission and a top speed of 155mph.
The 2007-2008 350z has 306HP and different wheels and LED lights and a buldge on the hood. 0-60mph in 5.2 seconds for manual transmission and top speed of 155mph.
Automatic versions are slower by 0.5+ seconds from 0-60mph.
March 4th, 2010 | 
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Its now called the 370Z because they used to have 3.5L Engine for the 350Z and now they made a 3.7L which is why they call it 370Z. The 370Z has 18 More HP than the 350Z which is 338HP.
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597 Hp at the rear wheels.
For the 2003-2006 model, it is 287HP. 0-60mph in 5.5 seconds for manual transmission and a top speed of 155mph.
The 2007-2008 350z has 306HP and different wheels and LED lights and a buldge on the hood. 0-60mph in 5.2 seconds for manual transmission and top speed of 155mph.
Automatic versions are slower by 0.5+ seconds from 0-60mph.