The 1967 Pontiac GTO got a modest styling refresh, but the real story was a single option buried on the order form: the L67 Ram Air 400, installed in just 56 convertibles out of more than 81,000 GTOs built that year. Higher-revving power, a Rochester Quadrajet carburetor, and a mid-year cylinder head change made it one of the most collectible GTOs ever built. Read on to find out what actually separated a genuine Ram Air car from an ordinary 1967 GTO.