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cats meet the manifold, right next to the block, i tried getting under the car with a breaker bar and i broke my entention

Liberal amounts of liquid wrench. Let soak for at least a day and reapply. Turn on the car and get them hot if necessary. Use a good quality extension. You'll be putting a lot of torque on it when breaking them. Last resort would be a torch. Replace w/ stainless bolts/washers/nuts and anti-sieze. You won't have the problem ever again (unless you DON'T use anti-sieze!).