Mustang ecoboost help
So i absolutely love the new s650 mustang ecoboost especially the premium package the only thing is i can't even get the car i am currently 20 years old i was told that the best thing to do is get financed through your bank and get the car I bank with arrowhead I am under my sisters credit and have around a 689 credit score but i am not under as a authorized user so I dont have a credit history at all and im not fortunate enough to have anyone co sign for me i have a job and make around 800 weekly i pay 450 in rent and around 220 insurance for my current car my current car is 2016 hyundai sonata payed off its a decent car but for as long as I can remember i want something im proud of owning something nice i only have 1k in the bank at the moment so i can't do a proper down payment without getting crazy high apr so my question is if someone can share some wisdom to help me with my situation to getting the car ive tried starting side business but my car is pretty small to start any manual labor work so literally any idea or wisdom helps.