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Rare Isdera Imperator 108i flexes its considerable muscles

The Isdera Imperator 108i is a remarkably rare supercar from the late 80s and early 90s. Born of a Mercedes-Benz concept car, it's powered by a range of AMG-developed V8s, with five to six liters of displacement, depending on the engine. The example shown here, lapping the legendary Spa-Francorchamps circuit, features the most potent 6.0-liter V8 available. And rather than just being driven about on a perfectly clean racing line, it's freaking power sliding!
Yes, there's something eternally childlike about a wedge-shaped supercar from our formative years being flung about a Belgian racetrack. Adding to the appeal is the Imperator's stumpy, periscopic rear mirror, sticking out of the roof. Even after being out of production for 20 years, this is still a wild, wild car and we'd happily snap up the opportunity pilot one of the 36 Isderas that were built. Take a look below for the full video from Spa.

Automakers' sound systems: Crank it, don't yank it

Years ago, one of the first things most music lovers did after buying a new vehicle was drive to an aftermarket stereo shop to get the crappy stock components swapped for better gear. And you'd typically get not only better sound but also more bang (and boom) for your buck. But in the past decade or so, the overall quality of OEM audio has dramatically increased, while car electronics became more complex, removing the incentive for most new vehicle owners — and all but the most hardcore DIYer — to start from scratch. In 2010, I did a comparison of the average costs for OEM electronics vs. similar offerings from the aftermarket, and back then automakers' stock premium systems were by far the best bargain — and are probably an even better value now. The premium 14-speaker, 1,200-watt JBL system in the all-new 2019 Toyota Avalon is a prime example of this trend. It's standard on the top two Limited and Touring trims and is available as a $680 audio upgrade on the XLE and XSE. I doubt you can even buy 14 speakers and 1,200 watts of amplification from the aftermarket for 700 bucks, much less have it all installed. And because the system is bundled with Toyota's Entune infotainment system, Apple CarPlay and a surround-view camera, removing the head unit means you would likely lose these features. Another advantage of OEMs and their audio partners is they can design the car around the audio system. In the past, automakers would typically place speakers where convenient for packaging, not for optimal sound reproduction, and audio engineers were forced to compromise. But as with the Avalon's premium JBL audio system, this is starting to change. At a recent behind-the-scenes peek for media into the process of developing the system, Toyota and Harman engineers delved into the minutia of sealing the inner panel of the front doors to create an enclosure for 6x8-inch woofers, making space in the pillars for JBL horn tweeters and extensively measuring the acoustic properties of the interior to tune the sound to the space. I'm met some creative and skilled car stereo installers, but none with a degree in psychoacoustics. The system is also the first to feature Quantum Logic Surround that creates a multi-channel listening experience from two-channel sources. And it includes Harman's Clari-Fi processing that "rebuilds key details lost" in compressed audio formats used by streaming music services and MP3s.

Car subscription services: A slow, expensive start — but the potential is huge

Americans are used to paying for subscriptions — to magazines and cable television, for instance — but experience shows they'll cancel when the price of admission gets too high, or there are more tempting alternatives. Cord cutters ditched nearly 1.5 million pay-TV subscriptions in 2017, according to a survey by Leichtman Research Group. Cable TV started out cheap with basic offerings, and then got expensive. The auto industry's subscription offerings are new, but they're starting out costly, and not price-competitive with traditional leasing. The upside is that they take the hassle out of car ownership for busy people by letting the service take care of maintenance, insurance, licensing and taxes. And they give consumers choice, often allowing relatively painless switches between different cars in the automakers' lineup. Subscription services also point the way toward an ownership-free auto experience, and offer an easy transition to a potential world where ride- and car-sharing will be dominant. Subscriptions are here to stay, but consumers may take a while to "get" them. Lincoln's subscription service for lightly used 2015 to 2017 models, offered through the Ford-owned Canvas beginning this year, got off to a slow start. Many early subscribers canceled. Last month, Cadillac announced it would " temporarily pause" its $1,800-per-month Book subscription service for "adjustments" as of December 1. According to the Wall Street Journal, "Snags with the back-end technology used to support the service made some customer-service functions tedious and time-consuming, adding costs for the company." The challenge for automakers is to come up with a strategy that offers consumers a compelling, affordable option to regular ownership, and one that can also make a profit. I think they'll find that sweet spot, but they're not there yet. Jack Nerad, former executive editorial director at Kelley Blue Book and author of " The Complete Idiot's Guide to Buying or Leasing a Car," points out that "A lot of people expected that subscriptions would be very valuable for people who wanted inexpensive transportation, but the reality is quite the opposite. Subscriptions are offering more choices for the wealthy.