| MegaZ is a radiator air guide that goes before the radiator on top of the engine bay. The powertrix deal is simply a cover for the stock shroud. You can smooth and paint as has been suggested.  However the plastic can get a bit brittle, so cracking can be a problem. Somewhere down the road I'm going to try to make one out of some thin gauge aluminum or possibly fiberglass.  I'll probably retain the stock lower plastic piece for ease of installation. 
 
 
  "The 300ZX Turbo is a dance; it's a song; it's rolling, roaring automotive art.  There is no color that doesn't suit it.  There is no mood-lifting chemical substance it can't replace." - Automobile Magazine
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