c63 removed resonator drive by 2

My Grandmothers C63 at it again.

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Mercedes-Benz C63 AMG, Resonator Delete, K&N and Loud Acceleration!
Just doing a test with the new GoPro. It picks up the Exhaust sound very well on the trunk! Enjoy!

C63 2nd cat and resonator delete

C63 removed resonator... drive by

C63 Strange noise after resonator delete
Does anyone have a clue what this could be. No leak was identified. The resonator was modified and has a straight pipe going through it.