FOUR years into the life of its standard-setting 3 Series Coupe and with its first folding-hardtop convertible now almost three years old, BMW has applied a subtle but effective midlife makeover to its mid-size two-door models amid renewed opposition from Audi’s growing A5 range and the new E-class Coupe and Cabriolet from Mercedes-Benz., , More performance and efficiency for the base 320d, a manual version of which also brings a lower entry price, and more flexibility for the new-look 335i M Sport models – which as a result are more expensive – are welcome changes, but the biggest advance is improved ride quality for the top-selling 320d, 325i and 330d models., , Throw in more aggressive bumpers, more upmarket LED headlight elements (optional on all but the 335i), a host of new paint, leather, trim and wheel options, and idle-stop technology for the 320d manual and all M3s, and the 2010 3 Series Coupe and Convertible should be well armed to fend off its formidable new adversaries.