My cats and y pipe were a bit worse for wear so snagged a Stillen y pipe from someone on here and Zmanalex hooked me up with some (we think) unbranded hfc for free since they had been badly bent...
Anyway, I didn't want to keep my oem cats/y pipe and priced around different scrapyards. Received offers from £80 right up to £300 (which I took). That more than covered the cost of my replacement parts, but made me think even if anyone was just looking to swap to hfc, it could be done for very little money.
... Just in case anyone's on the fence and needs a nudge in the right direction