Stillen Gen 3 or Injen, those are all you should really consider if you are into power gains. All the others look "nice," but not worth the extra money.
Stillen:
-Take front bumper off
-Expand a little hole to slide tube through
+Top power gains
+Filters only need to be changed/recharged every 100,000 miles
+Bumper removal is 15-20 minutes the first time, but less than 10 after that. It is just getting to know where all the pop rivets and screws are.
Injen:
-Take front bumper off
-Change washer fluid container
+Solid gains (not as much as Stillen)
+Non-oiled filters so cleaning is a breeze, but again every 50,000 miles or more
Also, I was not aware of a true Nismo intake system for the 370z yet, many shops were selling the 350z Nismo intake system which sort of fits.
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