Car Loan Help Please!!!?

I really want a Subaru WRX. It will be roughly 10,000-12,000 dollars and I have a 3,000 dollar Mitsubishi Eclipse I am selling. Plus the money I'm saving up, so all together I need about 6,000 dollars in loan. I dont have a cosigner unless my Grandma will help me out. I'd like to not have to ask if there is an alternative to doing so. Is there anyway around this? I'm 20 and I have absolutely NO credit. Or maybe even bad credit who knows... I also have Huntington Bank and I have gotten a 3500 dollar loan out before with my Grandpas cosign, he passed away not long ago but my father paid the 3500 in full about a year later. Thanks!