Motorcycles have an easy time of going 180. That being said it take ALOT more to go faster, 180 is like a mathematical barrier where aerodynamics has more to do with the limits than horsepower does. That's why the 'busa looks the way it does; Suzuki spent tons of $ to wind tunnel test that bike so it could go that fast. I also think that is why the dashboard on my Vitara is made from tupperware
friggin 'busa took all the budget that year!
Same goes for cars. There is no way a 280z would hit 200mph, its sahpes like a sea-container and the wind would slow it down immensely. As for Pontiac Bonnevilles, pfft,
you'd be better off tryin to make it last 7 years without falling apart than trying to make it go faster.