bmw e30 lacks power

i launched it at a light and now it lacks power and acceleration also sounds like the engine is louder and has a whining sound. any suggestions on what could be the problem would be appreciated.
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In article,
It could be anything with that description, but the first thing I'd do given the sound change would be to make a careful inspection of the exhaust system including the exhaust manifold.
But a damaged timing chain would meet that description too, it would just be a totally different sound. --scott
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Scott Dorsey

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