Porsche’s glorious new hard-core Boxster Spyder is a 180-mph investment opportunity, blogs Road Test Editor Howard Walker. Maybe a decade from now, there’s an exceedingly good chance you’ll be lamenting the fact that you could have, no should have, bought a ‘16 Porsche Boxster Spyder. How come? Not only is this the most powerful version of Porsche’s much-loved mid-engined roadster ever, it’s the grand finale of the naturally-aspirated six-cylinder Boxsters. From now on, Boxsters will come...