Regarding the recurring CEL light, my V70 T5 had the same issue with the Ferrita downpipe, I added a spacer and a restricting washer to the post-cat sensor and it cured the issue.
Your car is way too good to scrap, dark interior and manual is a winning combination. I don't have a facebook account (I use my Wife's)
https://www.facebook.com/groups/186140668094132 I would try it here before Gumtree, Ebay, anything.