Question about boost

I downloaded a couple of cars that had an option where if you pressed T you would get a large boost in speed, I was wondering if there was a way to enable this feature on different cars.

 

some cars have rockets like this one: http://www.beamng.com/threads/5300-DSC-Rocket-Plane-Bolide?highlight=rocket in this case if you press 't'... it will give it "boost"....most cars do not have this unless you mod it and add rockets XD