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With an upper plenum such as Crawford, you may not be able to use a brace similar to the OEM brace. The OEM brace goes over the top of the plenum. There is not enough room between the plenum and hood for an OEM style brace. What you need is a straight brace with sits in front of the plenum. Check these at froogle:
Unless someone else designs a new one, the ONLY one that will currently fit on a "raised" plenum is Crawford, Stillen, & APS. There are some spacers that may fit but since you're going for a Crawford plenum, you're limited to only these 3.
With an upper plenum such as Crawford, you may not be able to use a brace similar to the OEM brace. The OEM brace goes over the top of the plenum. There is not enough room between the plenum and hood for an OEM style brace. What you need is a straight brace with sits in front of the plenum. Check these at froogle: