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Ad Up all you spent on customizing it, look at that amount and know how much you lost customizing you’re car the way you liked it. What you like others might not. I’m not being rude, just stating a fact. I’m sure someone will like what you did, but you won’t get much if any of a return to what you spent.
What Crabr1 said, plus:
condition, paint/body, interior…
milage
pictures
factory options
modifications, you may not recover you investments, but they might make the car more attractive to a buyer.
FWIW, I paid 18K for my 2000 convertible with 43K on the clock. Also a one owner, well maintained six speed. No mods, completely stock except for a color matched ZR1 style rear spoiler.