I have an AAM 2.5 True Dual exhaust for sale and available right now for $800. It comes with 5" GTR tips or the standard stainless 3" tips. The sound is awesome imho. Here is a thread and short review. There are a lots of videos of this exhaust on YouTube. Just PM me if you are interested as I will be in Cali over the weekend and the exhaust is there as it was taken off of my Z and now it time for me to take my baby home. 
2010 Nismo and AAM 2.5" True Dual Exhaust With GTR Ti Tips
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