Seat Leon Cupra ST300 vibration

May 21, 2024
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Hi everyone,
recently my 2018 Seat Leon ST300 Cupra Performance started to have this rubbery-ish vibration under full throttle acceleration (just when haldex kicks in).

Vibration it self is coming from the back of the car and continues to the front.
I replaced Hardy in the rear and no vibration appeared for a 100 to 200 km. After another 500 km the vibration suddenly came back.

Recently I gave the car a short yet intesive driving (launch control included) and after cool down drive home on a highway the car was vibrating as hell while cruising 130km/h. After couple minutes the car was suddenly ok🤣

PS: Wheels arent bent, tyres are new, 108xxx km on the clock & all looked okay while being on a lift

Has anybody experienced something similar?
Thank you in advance for any tips and answers!
 
Lecatona HPFP (High-pressure Fuel Pump Upgrades)