I think if they're quality parts then better to be honest and sell with the parts and presumably provide the stock items with the sale.
It won't appeal to everyone of course, but I'd prefer this over looking at a stock car that I then work out has just been returned to stock for sale. There's a reasonable number of R adverts confirming the mods done.
As you said it's not a financial thing, they're pretty much worthless in a car sale, but might get you a deal quicker if someone's looking for something already set up.
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