If the car runs well and you want a NAV system, buy a Tom Tom or whatever.
The upgrade map CD's cost more then the good Tom Tom which comes with free lifetime updates. My Tom Tom gets updated 4 times a year. FOR FREE.
224,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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