This radiator is a perfect OEM replacement for 2006 G35 sedan. Other things I tried before the swap to try and fix my high idle (1050rpm) after a ride. approx. 10-15 minutes: thermostat and water pump. Nothing seems to have happened to the old ones, but I think I have rest for another 75,000 miles. It was delivered beautifully in a double box with little or no damage to the fins. It might be a bit more expensive than all the plastic ones but since it has an all aluminum core I was willing to pay a little more and you can't go wrong with the Prime! The exchange took about 2 hours but I'm much happier now that my motor can cool properly =D