Go to a few different car valuation sites like KBB and input your vehicle as if it was stock, and find a ball park AVG base price for the mileage/condition.
Then take MSRP of all your mods (not including install) and take 50% of that value and add it to the previous base price. IE if someone could purchase all those mods for $6k new, you can add $3k to asking price.
That would probably be a decent starting point.
Any maintenance type items IE battery, alternator, fluids etc... don't really add any value. it's not bad to list it on the ad if done very recently so buyer maybe has less room to negotiate price down. but really maintaining a car is to be expected.
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