It would be fine with the silencers installed. Without the silencers it is too loud already. Like shake the car loud and give you a headache after 1 hour of driving loud. And I have 80 lbs of sound deadening material lining everything from the foot wells all the way back to the trunk.
Here's some pics of the pieces and installed pics for reference from anyone interested in buying this guy's exhaust. I love mine.
Nissan 370Z Forum - TXSpeedDemon's Album: Greddy Turbo Ti-C Exhaust