The upgrades WILL make the car stand out against the sales competition but you won't get back much in the purchase price. In fact, the buyer might de-value the work almost entirely unless it was done by a reputable shop and you have receipts. DIY work is very hard to value on re-sale.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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