Can you narrow down where the sound is coming from? Does it sound like it is coming from the engine (front of the car), not from the exhaust? Is it also more of a whirring, mechanical type sound?
If so, it might be your fuel pressure regulator talking. They tend to make noise around those engine speeds, especially when the engine isn't thoroughly warmed-up yet. If I pay attention, I can hear it every time when I first get on the highway. It is a normal 240 sound, I've replaced mine once and it still makes a sound similar to the old one!
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90 244DL 263k :)
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