2001 K11 start to rattle at 1500rpm

So a couple week ago I was doing 160 km/h for the first time with this car and all was good until the next day when my car start to rattle at around 1500rpm on all gears.
The sound is on the passenger side (RHD). I think it might be the timing chains? I'm no mechanic, but I want to know what I have to expect. And next to that problem, the clutch pedal make a squeaky sound after that day too.

Anyone knows what the problem might be?
 
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