Snake oil..
On a carbed engine it might help (talking about a Gasket not a Spacer), as it might decrease the aluminum temp of the manifold and since the manifold is wet it absorbs the heat better.. but really 10-20* different intake manifold temps isn't going to effect a dry manifold that...
no, but these are awesome! http://cgi.ebay.ca/Toyota-Supra-or-MR2-Air-Intake-Keyword-Add-HP-Save-Gas_W0QQitemZ330098990475QQihZ014QQcategoryZ42604QQtcZphotoQQcmdZViewItem
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