Welcome. A lot of the things the car needed are easy to replace yourself, this forum is a lot of help there as well as saving more money buying the parts online. Also you say the car costs you 7.5 k but in reality I (as well as many others on this forum) don't think of modifications as the price of the car since they don't really add value. So 4k + 1.8k, but doing the work yourself can make things real easy on prices.