THE fastest-ever production Astra has just been launched by Vauxhall. The Coupe Turbo is priced at £18,995 and uses a new 188bhp turbocharged 2.0-litre engine, providing a 0-60mph time of 7.0 seconds and a top speed of 152mph.Featuring uprated brakes, darkened tail lamps, and unique 17in alloy wheels, the Turbo is distinguished from its normally aspirated counterpart.