not to get too off track but say u have a 10,000 civic and mod it up to 20,000 to 30,000 its ok but crazy,,try doing that to bmw its already got the great suspension but u can mod and the rear,same with engine ,problem is the car whether bought or leased depending on model and yr ur starting at 40,000 before even getting started,e36,e46 you can get good prices m3,330,328,325,then u add.