Intensive acceleration. Strange behavior when slipping. (+video inside)

Hi, guys!

Need some help to identify problem with my Clio RS200. Or to identify, that it is not a problem :biggrin:
There are knocking noise from the front of the car when slipping. From the inside it seems like wheels are jumping. :001_huh:

[YOUTUBE]Tt6ywyNMKG0[/YOUTUBE]
On the video we can see, that wheel spin is not smooth.
Applicable to wet or dry tarmac. ESP off.

This issue really annoying me :worried:
Any ideas? :001_unsure:

2011 RS200, not cup, Mileage 10000 km. (~6300 miles), stock tyres Continental SportContact 3
 
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Same here. The exhaust is definitely knocking!

As for the wheel spin surely that's just the tyres trying to gain traction:-/