If your idea of nirvana is clutchless gear changes with zero lag up and down the cogway, today may be your birthday. So says UK-based Zeroshift, which claims to have developed an add-on mechanism that replaces a manual tranny's synchromesh. It's called the Zeroshift Automated Manual Transmission (AMT), and the company says it can change gears seamlessly — more efficiently than VW/Audi's sublime DSG box. (Here's how it works.) The chart pictured shows the AMT in use on a TVR Cerbera 4.2 equipped with a Tremec T5 five-speed manual. The company says on passenger cars it can reduce wasted fuel, while in more sporting applications — well, you know.