about the cervinis hood I've heard they are the best because of their fit, I really don't know if their ram air kit really works.
About the vents, I'm thinking on getting this subaru ones (only if I ca'tn find a hood of a locally made galant that had an excellent ones). I think you won't find ones specially made for the stang. You just have to find one that fit. And get the hood cutted or do it yourself.
lito
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