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If you want to get the scoop on the best camshaft upgrade for your 2008-2015 Mitsubishi Evo X, we have you covered. The 4B11T is pretty good out of the box, but with a some billet and elbow grease, you can extract so much more. GSC S2 cams are 274 duration on both intake and exhaust, but of course we carry many other options that cover that ranges you're looking for such as Brian Crower Stage 2 @ 272 and Tomei PROCAM @ 280.