The cost of the kit you would think the silicon hoses would be specific to that engine.
....Logical and ideal from a customer pov, but you say that without appearing to know that much about the practical economics of relatively small production runs which a manufacturer like Forge or their specialist supplier has to allow for.
Consider all the R&D costs and then the production costs of what is a low volume product designed and built to a high standard using high standard materials and then tell me it's expensive.
I think there are no less than 5 different 2.0T FSI platforms and hence sets of sizes to cater for.