I’m running mK7 . No issues at all to be honest. Sounds pretty normal under light acceleration, until u put the foot down. I’m running an estate so my exhausts aren’t valved and have to do most of the control through light or heavy right foot. Mrs drives it most days as well with the baby in the back and he just sleeps so no issues there. Done 150 mile round trip yesterday with my grandmother and great aunt and they made no comment at all. Just said the seats where great. So overall 4 month old baby to 80 years plus have no issues , not sure many can review it like that to be honest.