Vibrant Performance 1047 Streetpower Oval Muffler W/ Dual 3.5" Round Tips (3" on 2040-parts.com

Concept Car of the Week: Mitsubishi HSR (1987)

In 1987, Mitsubishi initiated a range of concept cars called HSR (High Speed Research) with the intention of creating a futuristic vision for the brand combining advanced technology, efficient power and aerodynamic design. The first concept car was designed for safely cruising on the motorway at very high speed, thanks to cutting edge electronics. The car's internal computers measured speed, weather, driver input and grip, and adjusted the 4-wheel drive system and the 4-wheel steering automatically.

Rennsport Reunion IV closes with Porsche 917s tearing around the track

Rennsport IV, three days of serious Porsche love at Mazda Racway Laguna Seca, concluded on Sunday with a half-dozen races around the picturesque track near Monterey, Calif. And while there were a variety of all things Porsche to see and hear through the three days, Sunday saw some of Porsche's most powerful race cars take to the track. It was certainly a case of saving the best for last.

Heifer fuel

Unlike most people, when Michael Doyle drives past a herd of cattle grazing in a field, he doesn't see future tenderloins or T-bones. He sees fuel. The company Doyle co-owns, North Star Biofuels, is about to start production of biodiesel at a new $15 million, 20,000-square-foot plant in Watsonville, Calif., about 60 miles south of San Francisco.