Arctic Cat A 400 4x4 05 Rear Axle Tube Left 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.

Lamborghini Newport Beach is first with new exhaust for the LP-700-4 Aventador

If the stock exhaust of your Lamborghini LP-700-4 Aventador isn't quite what you're looking for, Lamborghini Newport Beach has the solution. The Aventador's 6.5-liter V12 gets a distinct note courtesy of the Southern California dealership, which specializes in creating new exhausts for Lambos. Lamborghini Newport Beach's bolt-on exhaust system is undergoing final testing before being released for sale.

2014 Acura RDX priced at $35,415

The 2014 Acura RDX goes on sale Wednesday with a base price of $35,415, including $895 in destination charges. Stepping up to the technology package brings the price to $39,115; all-wheel drive adds $1,400. Only one powertrain will be offered for 2014: a 3.5-liter V6 with a six-speed automatic transmission.