The next Porsche Boxster will feature a four-cylinder engine for the first time, Stuttgart insiders have said. Few details are known about the entry-level Boxster, but it is “the most economical Porsche ever” according to company sources. Porsche’s most economical models are currently the 2.7-litre Boxster and Cayman, which emits 222g/km of CO2.The turbocharged engine is likely to offer just over 200bhp, and next Boxster is expected to be significantly lighter than its predecessor. Expect this entry-level model in 2011.