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The 2006 Honda GRX Concept was a lightweight compact sports car displayed at the 2006 North American International Auto Show in Detroit. Developed by Honda R&D Americas (HRA) in California, the GRX combined ideas from Honda's motorcycle and automotive engineering programs. The GRX used an unusual 1.5-liter horizontally opposed six-cylinder engine originally developed for motorcycle applications. Honda installed the compact flat-six in an ultra-light sports car intended to com

The 2006 Honda Civic Type-R Concept was shown at the 2006 Geneva Motor Show as a preview of the next-generation Civic Type R. Based on Honda's three-door Civic hatchback, the concept was very close to the production model that would follow in 2007. Power came from a 2.0-liter four-cylinder i-VTEC engine producing around 200 horsepower. Honda stayed with the traditional Type R formula, using a high-revving, naturally aspirated engine rather than a turbocharger. The production

The 2006 Heuliez Macarena was a four-door convertible concept based on the Peugeot 407 sedan. It was designed and built by French coachbuilder Heuliez and shown at the 2006 Geneva Motor Show. The concept was created mainly to showcase a new retractable hardtop system while keeping four doors and four seats. The Macarena's main feature was its three-piece glass roof. At the push of a button, the roof folded into the rear of the car. The long side guides crossed over each other