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The production exhaust crossover sends an enormous amount of heat into the manifold, costing power. With the high heat conductivity of an aluminum manifold, it's just way too much for a performance effort, and debatable in regular street duty. The manifold will pick up plenty of heat just from the front coolant crossover and heads for all but the coldest climates. We used Fel-Pro #1213 gaskets to block the exhaust crossover.