Since its inception in November, officers have written more than 700 tickets for illegal modifications to cars.
But diesel converts like Mr. Earley are quick to point out that with little or no modification, their cars could also run on vegetable oil or other biodiesel fuels, if an infrastructure for such fuels were ever made widely available.
If you do add any modifications to your car, you must tell your insurance company, if you don't and you damage your car, they will not pay out.
Modifications to the car's back seat and trunk suggested it could have been used as a sniper's perch, with the gunman hidden flat in the car and firing through a hole in the trunk lid.
Fossett's crew subsequently made several modifications to the car to prepare it for 800 miles per hour, including aero improvements to the rear body and wheel fairings to reduce drag.
George Barris, known to some as King of the Kalifornia Kustomizers for his artistic car modifications, said he installed the first television in a car, in the dashboard of the 1953 Golden Sahara, a bubble-topped vehicle used in the Jerry Lewis movie "Cinderfella".
She said that she and her husband, Karl Soderlund, made no modifications to the car, an indication that whatever technical data she received from the factory (called Smartville, wouldn't you know, in Hambach, France) answered the concerns of the customs service.
The modifications to the car are all sensible, but Ferrari do need to go again.
Ferrari had some modifications to their car's aerodynamic features in China and it was clear from the speed-trap figures that they had made a step forward on engine performance as well.
For the engineers at Bloodhound, switching rockets will mean having to make some subtle modifications to the car, not just to fit the new hybrid into the available space, but to position its mass in a way that does not upset the balance of the car.
