I am thinking of doing a DD install on my 2003 sedan but wanted to see what the best place and prices for the adapters for the wiring and steering wheel controls is. My brother did this on his 2003 Maxima these things cost him quite a lot.

 

Good parts cost decent money, but for the G35 the harness is pretty cheap. It's the dash kit that's expensive. Expect to pay at least $150 for the Metra kit and somewhere in the upper $200's for the JDM kit. The steering wheel adapter should be pretty close in price at any reputable shop.

 

I got my steering wheel adapter from Amazon.

 

Ebay or Amazon

 

PAC unit off amazon -- $40 bucks shipped .. metra wiring harness off ebay -- $9.00 + $3.00 ship