The Continental GT Speed was launched in 2007 with improved performance over the already testosterone inducing GT. Improvements? Really, what else can Bentley do to make the thing more luxurious? Not much, but engineers knew they could add more power. The GT has a twin-turbo W-12 muscling out 552 horsepower, but that simply wasn't enough as the GT Speed has 602 horsepower and is a tenth of second quicker in going from zero to 60 mph in only 4.3 seconds.
This wasn't just some sort of basic engine tinkering, but rather a complete reengineering of the engine in order to reduce overall mass. With the help of a recalibrated engine management system, not only has the power increased, but fuel consumption and C02 emissions have improved. Unfortunately, these improvements doesn't mean you can escape the $3,600 gas-guzzler tax. Still, 602 horsepower may just be worth the extra tax.