Rattle help

When I accelerate in 2nd gear up to about 6k revs there is a rattle that starts, I've looked already at many posts about what it could be such as engine mount etc. I've sealed up my mount today but it still seems to do it, it does sound like it is coming from behind the dash but could be in engine bay and have also heard it's a fault on the exhaust you can't fix, anyone else had this problem or can suggest anything?

also have a sound coming from engine could be a belt or bearings in a pulley not sure anyone else have this sound? Sounds louder under the cover for timing belt, you can just hear a strange sound sort of a small vibration over the sound of the engine, video on link.

http://youtu.be/uzOwY2fH5W4

Thanks.
 
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