Dual-clutch transmissions started on the race track, but now they're on everything from supercars to hatchbacks. Here are my favorites, ranked.

· Dual-clutch transmissions got their start on race cars, but nowadays they're common on supercars.
· More recently, DCTs have moved to less expensive vehicles.
· Typically, they can operate in automatic or manual mode, using paddle shifters on the steering column.
· I've driven many DCT-equipped cars. Following is a...