It is very rare that a car like a Hennessey Venom GT goes up for sale. When we do find one, it is typically listed as a Lotus, because most used car websites don't have a category for a Hennessey. It certainly isn't cheap to buy one of the fastest cars in history, especially when it is one of the five produced in 2013, and the first ever Spyder variant. One of the five Venom GTs was purchased by Aerosmith singer Steven Tyler, who asked John Henessey to turn his car into a convertible. Now, this special car is up for auction.

When it was new, the Venom GT cost $950,000, but this special Spyder model was $1.1 million. Hennessey had to make several changes to the car to turn it into a convertible such as modifying the integrated roll cage, which added 30 lbs to the weight. To compensate, the car's power was upped to 1,244 hp to keep the one-horsepower-per-kilogram power-to-weight ratio. Tyler's Venom also has a custom audio system tuned by David Frangioni, a former audio engineer for Aerosmith and CEO of Audio One. The interior is black leather with red stitching and a red tear drop stitched into the seats that matches one of Tyler's tattoos.

The car will cross the auction block at Barrett Jackson on January 20. All proceeds will benefit Janie's Fund, Tyler's own charity that supports abused girls. We bet that the Aerosmith connection and charity auction will help this car go for well over the original $1.1 million price.