i have about 6 or 7 grand into my 325. But that was mostly the paint job, and the engine was out of my gray car which at the time was a project car which in total cost me about 2000. The gray car got all my cars hand me downs. The interior, the engine which we had rebuilt completely stock nice strong motor 70,000 miles on it. But for the 7 grand I spent I got 2 cars basically. because it only cost like 700$ to have the other motor freshened up. We had 5 of every part from over the years all the BMWs my family has accumilated and such so for 7 grand I got 1 nice car and a beater. Then I got an M3 ITE/DM Racecar which is nice.