I bought my car for 2500, it has probably 9k in development into it. some cage work that made it 06/07 legal and a motor and I was racing. (900 total spent on that.) I did do a few things I didnt need (easier to read gauges, some minor rewiring.) And some stuff the car needed like oil cooler, better alignment and stuff. In the end probably spend about 5k. When I priced out what it would take for me to build that same car I was around 14k in costs and that included me doign most of the labor.