A Toyota spokesman we asked told us that there are no plans to bring in the 4Runner.

It's an old stager and I'm guessing it's done heaps of miles. Have it serviced.

I wouldn't recommend it. Having done 190,000 km the engine is relatively old and worn, adding the stress of a turbocharger won't help it. On top of that if you make use of the extra performance you would get from adding the turbocharger, as most people do, you won't see the fuel economy benefits and you're likely to damage your engine.