Plenum spacer
Yeah i had no clue. Got it from a lowkey dealer and it was from a trade in
Next assignment for you is to find out if it is an Iso-thermal or Copper type or just a spacer alone.
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Looks like a 5/16" plenum spacer to me too! He doesn't need to tear up his plenum just to find out if or not he has a copper gasket! The spacer is a bonus any way you look at it 
Gary

Gary
most likely do this when its a little warmer. planning to polish the plenum
Joined: Mar 2009
Posts: 18,299
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From: By the sea, Tx
G35 sedan w/ too much money in mods

Do you mean the iso thermal gasket? The copper part attaches to the throttle body to regulate coolant flow so the TB stays warmer in cold climates.



