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Track and Field: Today's track day cars offer more for less

The imminent arrival of the Scion FR-S and the Subaru BRZ have many enthusiasts thinking about the track-day-filled summer ahead. Since both of these rear-wheel-drive coupes will be available in limited numbers, we're going to explore some other options for track-day cars that could be as fun as the new sheetmetal from Japan. We'll start with the less expensive stuff and work our way up, without crossing the $50,000 threshold.

Audi RS5 TDI Concept gets electric turbo and 380bhp

The Audi RS5 TDI Concept (pictured) gets an electric turbo It’s two years since Audi revealed it was working on an electric turbo to be used in a twin-turbo setup, with the electric turbo able to offer boost pressure from much lower down the rev range than a normal turbo. That has turned in to the Audi RS5 TDI Concept, where Audi has replaced the normal RS5‘s V8 with a 3.0 litre TDI engine with a small electric turbo for low rev work and a bigger turbo to do the higher rev stuff. The electric turbo works from the off to provide maximum torque of 553lb/ft from just 1250rpm, before the bigger normal turbo takes over at 3,000rpm to continue the boost.

2014 Mercedes-Benz S63 AMG revealed

Mercedes-Benz's AMG performance-car division has officially revealed its new 577-hp S63 AMG ahead of the rapid sedan's public Frankfurt motor show debut in September. Several traditional AMG styling mods distinguish the S63 from recently introduced but lesser S-class models (“S-class Stunner,” Autoweek, May 27). They include a deep new front bumper, chromed blade grille, twin-turbo V8 badges on the side and beefed-up sills.