I’ve had two of those pipes split. Mines a bi-turbo, first one was replaced like for like, second had more concertinas. Van is 17 plate and has done 70k. See how long the redesign lasts but would have thought vans that haven’t failed yet should be done. VW probably don’t see emissions in the cab as a problem, watch the Dirty Money doc on Netflix. Out of warranty the part apparently costs around £130 and an hour to fit, I’m extending my warranty.