I saw an article or something somewhere where someone had developed heat-insulated intake manifold spacers for Honda engines, where it causes the intake temps to drop (since the manifolds absorb less heat from the engine block), and torque and HP increased across the board.

Seems like that would be a nice, relatively cheap and easy mod for the 13B, especially since our intake manifolds are hot enough to cook your breakfast...

 

Ebay sells them for our engines. I hear they are great and I think I will pick some up as well but im also worried about the radiant heat from the engine block to the intake manifold.

 

http://cgi.ebay.com/ebaymotors/GIZZM...spagenameZWDVW

Doesn't mention NA or Turbo though... (looks like it's for the turbo engine)