1963 Porsche 356b Base 1.6l on 2040-cars

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Watch MotorWeek review the last great air-cooled Porsche 911

These days air-cooled Porsche prices are blasting through the roof, and the 993 gets much of that love among collectors as the last generation before the 911's switch to water-cooled design. MotorWeek's latest Retro Review now looks back at the 1996 911 Targa. The coupe came from a brief period when the 911s were the only models in the brand's lineup, but the company made sure those cars were perfect. The point of Porsche's Targa models is to combine the open-air driving of a convertible with a security of a coupe. In this case, the engineers came up with a massive glass panel that slid into the roof at the touch of a button. The design still allowed for rearward visibility but created a giant opening to allow the sunshine in. The solution isn't as awe-inspiring to watch as the Transformer-like metamorphosis of the latest 911 Targa, but it gets the job done in a very unobtrusive way. As air-cooled values continue to creep upward, it's fascinating to hear how contemporary reviewers critique the cars. In this case, the 993 lives up to the promise of being the ultimate evolution of the original idea behind the 911. MotorWeek even calls the coupe "simply one of the best road cars ever made." Check out the video to find out why. Related Video:

The 1994 Porsche 911 Speedster only looks weirder with age

The 1994 Porsche 911 Speedster is undoubtedly a rare car, and it's even rather quick by the standards of the era. However, the designers weren't at their best when they created the odd shape at this model's rear. MotorWeek remembers this classic Porsche's exciting performance and weird look in its latest Retro Review. The Speedster's design isn't all bad. The front end still looks fantastic thanks to the nose of the 964-generation 911 and a steeply raked windshield. We can even live with the body color wheels. However, things get much worse at the rear where the hard cover, which hides the roof, gives the convertible a hunchback. As MotorWeek shows, fitting the manual top is quite fiddly. Porsche might have been better off from a styling perspective by leaving the back smooth and completely ditching the complicated roof. You can't get a good look at the weird rear from the driver's seat, and MotorWeek says that the Speedster excels once you're behind the wheel. The handling and braking are reportedly especially good. Sport seats grip the driver closely, and even with 247 horsepower, the convertible gets to 60 miles per hour in 5.4 seconds. With the weather starting to warm up, it sounds like a great experience, and you can imagine taking a ride in MotorWeek's latest video. Related Video:

VW internal investigation finds 'no evidence' against suspended engineers

Volkswagen is still working out the chain of events that led to emissions-evading software being installed in 11 million diesel vehicles worldwide and deciding who was responsible for the treachery. So far, the German automotive giant's internal investigation hasn't publicly named many suspects, and three suspended executive-level engineers have been found not to be culpable in the wrongdoing, according to an anonymous insider speaking to Reuters. VW knows that the software began being installed in the EA 189 engine in 2008. The internal investigation has found that the emissions-evading tech was created because the powerplant was found to fail US standards. Plus, the diesel mill wasn't meeting cost targets, according to Reuters. The automaker responded by suspending over 10 employees, but three top engineers among them might not have been involved. Those put on leave include Heinz-Jakob Neusser from VW, Ulrich Hackenberg from Audi, and Wolfgang Hatz who led Porsche's research and group-wide engine development. The internal detective work hasn't turned up any evidence against these three men. In addition to VW's own inquires, government investigators in both the US and Germany are taking a serious look into the company's actions, too. So far, the automaker is setting aside about $7.3 billion to pay to fix the vehicles with the evasive software. Depending on what authorities find, the costs could grow quickly. Beyond the financial implications, the scandal has led to a serious shakeup in VW's corporate structure. Related Video: