What I was getting at was as far as invalidating the warranty is concerned, lowering your van onto minus 40mm springs for example isn't going to affect all the very many different parts and systems on the van not related to the suspension height hence invalidating the warranty. IF you subsequently had an issue with the driveline system (drive shafts or cv joints etc), the VW dealership would maybe put this down to alterations to the suspension causing it however, but in most cases, suspension drop would have to be quite extreme for this to happen imo.? Not sure what you mean, the vehicle has its VW warranty. The question I am asking is sticking to the known sportline spec is there anything else that can be done to improve handling without it causing issues with warranty i.e. Fitting Roll bars do they impact warranty?
I think you are right, I don't recall any T5/T6 being refused warrantee work, even when they have been sensibly modified. I certainly recall arguments over fair ware and tear, but that is a different story.What I was getting at was as far as invalidating the warranty is concerned, lowering your van onto minus 40mm springs for example isn't going to affect all the very many different parts and systems on the van not related to the suspension height hence invalidating the warranty. IF you subsequently had an issue with the driveline system (drive shafts or cv joints etc), the VW dealership would maybe put this down to alterations to the suspension causing it however, but in most cases, suspension drop would have to be quite extreme for this to happen imo.
Point I am trying to (poorly) make is many people alter all sorts on these vans and still get warranty work done when required.