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Noisy old Jetta

I have an 88 VW Jetta that makes a pretty loud roar from under the hood anywhere above 25mph, becoming louder and more high-pitched with speed. At first, I thought it might be a leak in the exhaust manifold or something. But that can’t be if it doesn’t matter what gear it’s in or how high the engine is reving right? Even if I coast at 1rpm, the noise is the same. Help me out!