I'm considering tubs and wondered if stock seats need modifying? I've tried trying to find photos but photobucket has ruin that.
They won't be big tubs either.
Depends on the tubs.
My tubs go all the way to the bulkhead, so I had to chop the back of the stock seat base.
However I have seen many smaller tubs (e.g. TQR) that effectively sit inside the seat base, so you don't have to modify anything