Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

Vintage photos show Ford Mustang I and the elusive XD Cobra

It's hardly surprising that our readers want to share their memories of the Ford Mustang -- 50 years is a long time for an automotive nameplate to endure, and the model's upcoming 50th anniversary is as good excuse as any to look back on the experiences that have made the car an enthusiast hit. Take William Drew, who had a close encounter with pony car history when he saw the Mustang I concept, plus a rare Ghia-bodied Shelby Cobra concept, at an auto dealer in Dallas in 1970. His slides (taken with a Yashica camera, he notes) show the unusual cars in the nice, bright colors of Kodachrome.

Audi RS7 Dynamic Edition is an expensive styling package

How much dynamism does one man need -- nay, deserve? Audi attempts to answer that with the RS7 Dynamic Edition, a trim package for the current RS7, which is pretty dynamic to begin with. The Dynamic Edition provides no power or suspension upgrades over the regular RS7, preferring to merely look more dynamic (as a proof-of-concept from the "Audi exclusive" program).

One Lap of the Web: Semi-truck drifting, quintessential British cars and Jay Leno's Garage

We spend a lot of time on the Internet -- pretty much whenever we're not driving, writing about or working on cars. Since there's more out there than we'd ever be able to cover, here's our daily digest of car stuff on the Web you may not otherwise have heard about. -- When you think of Gymkhana, you normally just think of Ken Block ripping up streets with a Ford Fiesta.