Airy: the new Smart Cabriolet. Thrifty: the Audi Q 7 e-tron. Reworked: the new-generation DS 4 from Citroen. Transformed: the VW Passat Alltrack. Competitive: the Ford Cosworth models Sierra RS and Escort RS.Present it!: Smart CabrioletGet a taste of summer with an open-top Smart car ride through ValenciaThe fabric roof in this new two-seater folds back in under 12 seconds and at any driving speed. And if the car’s stationary, you can even tuck it all the way into the trunk. With a few easy steps, the side bars can be removed and stowed safely away in the tailgate. The convertible model comes with a surcharge of €3,260 in Germany. That’s a fair whack, but it certainly adds to the fun.Examine it!: Audi Q7 e-tronA premium segment SUV that can hit 100 km/h in just over six seconds, but is also light on emissionsThe Audi Q7 e-tron Quattro - the carmaker's first plug-in hybrid to carry a V6 TDI-Motor and quattro-drive - is as sporty as it is comfortable and efficient. The batteries store enough power for the SUV to travel 56 kilometers emissions-free on a full charge. And Audi's 'Predictive Efficiency Assistant" calculates the most efficient hybrid strategy at the beginning of a trip, based on navigation data and real-time information on traffic conditions. Test it!: Citroen DS4With six decades of history, the DS is Citroen's design iconLast year, Citroen turned the DS line into a brand of its own and presented the new-generation DS 4. It unites all the attributes of a premium sedan: flowing, dynamic, elegant lines, a chassis with subtle chrome framing, and powerful, efficient engines. The high-quality, well-designed, exclusive interior fits the style of the new DS 4 perfectly.Taste it!: VW Passat AlltrackIn Germany, the VW Passat is popular with people who drive a lot, whether privately or on businessNow Volkswagen has come out with an off-road version of the Passat, the "Alltrack" - a cross between a station wagon and an SUV. The adjusted shock absorbers with undercarriage protection, widened sills, and robust wheel-arch extensions make the chassis strong and give the car a style of its own. The Alltrack is well-suited to pull a boat or a horse trailer.Vintage: Ford CosworthThey're fast, rare and boast huge spoilers -- the Ford Sierra RS Cosworth and the Ford Escort RS Cosworth.Two ordinary family car models were transformed into lean, mean driving machines that gave purebred race cars a run for their money. Christian Gratl, son of a race car driver, shows us what his Cosworths can do.