I used the GT 40 upper intake and was not very impressed compared to the Cobra "Extrude Honed" intake. Comparing the two I did managed to get another 15hp out of it. I had them gasket match to a Felpro 1250 and had the Edelbrock heads ported to match. The GT40 is a nice looking intake, but you can't do much with it.
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89 (GR40 Griggs)Hatch
89 Coupe
90 Coupe
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