You'll be lucky to get a bean for it unless you fall really lucky to be honest. Bit like standard intercoolers, airboxes and springs there are tons of them out there cluttering up peoples sheds after being taken off ST's when modded.
I would keep your standard parts to put back on when selling the car.
alot of people dont want modded cars (unless they've modded it themselves) as I'm finding out, hence had parts removed and refitted standard (which luckily were brand new for mine).
I also have 2 as new pre-facelift wheels with as new conti tyres - but want to keep them until car sold (if it sells)
when I was at profile auto saturday - they were just throwing out loads of standard exhausts - a big shame - cos in a few years when some need replacing on standard cars all these part used orignal ones will have been scrapped, and we will end up paying top prices at qwikfit etc..