Got mine up to 135 pretty effortlessly but had to slow down due to upcoming traffic & my exit. Bottom line. Top speed for these 350's are quoted at 156 mph from the factory. What kind of handicap (in mph) does the automatic have? Don't give me any blah, blah, blah about why I have an automatic. Because, thats what I have. Just answer the question :0 ) OK. Is the automatic geared as such to reach the same top speed as the 6 speed. Hopefuly someone will have my answer. If not, I may go out a pull one of those "don't try this at home" deals and find out for my self. BTW, at 135 my Z wasn't even breathing hard. Thats what leads me to think that it's capable of a good bit more.

 

The Auto's 5th gear is a little taller than the 6th gear on the Manual but it doesn't matter since the car is speed limited to 150ish.