my cdti 16v is getting mapped this weekend with a dpf removal and egr delete

i was thinking about fitting a twin exhaust and using a rear splitter from another vectra

question it what other vectra has the twin outlet rear splitter? its an estate by the way (passion waggon)

and also what estates had twin exhausts

also im not sure how the cdti exhaust is laid out but is there an uprated or larger turbo elbo you can buy as i know that can be a strain point on the exhaust