From a new turbocharger to Acura’s standout SH-AWD system, the 2007 RDX is built for fun and lively driving. Some would say that it took long enough for Honda/Acura to develop a forced-induction system, but most – after a ride in the RDX – will agree that it was worth the wait. Acura’s first turbo (see links at left for more) is bolted onto a 2.3-liter inline four-cylinder engine with i-VTEC valve control and Variable Valve Timing.