PerformanceThe RDX 2.3-liter DOHC i-VTEC® 4-cylinder engine artfully
combines the low weight and economy of a 4-cylinder with the power and
authority of a high-performance V-6. 
Here's what The Car Connection has to say: "The
2011 Acura RDX is considerably more fun to drive than most compact
crossovers. The engine---a 2.3-liter i-VTEC turbocharged four-cylinder,
making 240 horsepower--initially gives no hints (except if you spot the
boost gauge in the dash) that it's the only turbocharged one in
Honda/Acura's U.S. lineup, and the first for the automaker to ever bring
to this market. It settles into an isolated, distant purr that's worthy
of a luxury vehicle."http://www.thecarconnection.com/review/1054435_2011-acura-rdx_performance_3
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RDX Interior