Well I bit the bullet and bought stuff to do a dual 4" cold air intake system on the 87 G20. Will definitely find out how it helps the IATs. I found a discontinued NOS Spectre air cleaner housing on Ebay that holds a 14 x 4 air cleaner which should be in the package too. Seller still shows to have 8 of them. $150 shipped vs $250 that it listed on Summit when it was last available from them. I ordered some ducts listed for saw dust collection to fit into the core support on both sides of the cooling stack and some 4 layer flexible duct that looks very similar to what GM used externally. I will paint the lower portion of that polished housing black and leave just the lid shinny. Cannot stand the look of that much polished metal under the hood.
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