omgwtfreally

So, I have a question for those of you who purchased a new NISMO, first off I make 68k a year, transunion and ecofax are like 650 for a 2017 NISMO tech I wanted to get a good deal, first thing is first I was offered a full loan 48k it's tax and all, but they said I need 14k down that sounds like alotim not worried about the ARP, I want to do 84 months devided by 48k = so 571 a month payment I am able to more then afford that, I don't plan to pay for more then three years, but I still want to go with a 84 months, so, I wanted to try to get a good deal I've seen what a lot of people's otd price is and I thought I could negotiate, they said they don't get a rebate and they won't go much near invoice, so 44k 48 after taxes, I mean I want the car badly and I can afford the payments, but I don't want to put 14k down, im going to assume that's always up to the financial loaners? Regardless this is what I don't get they will loan me 48k, but 14k? I mean. To me I see it as getting a loan for getting a loan for 34k and just paying the difference, regardless I was curious if my g.f co signs will that make it so I don't have to do a down payment?
Anyone who is expert in any of this and could help me with some advice I want illuminum light up kick plates and license plate and floor mats car cover but I mean sure don't feel like a great deal that 48 does not include that stuff.
Also she has good credit with a lot of credit history all payments on time, and she makes 6 figures.
Thanks

One last thing, I used to own a 3G Eclipse my drive way is of and people tend to scrape I didn't in my 3G if I came in at the correct angle ground clearance on that car was 5.8 what is the 17 NISMO? I don't want to scare a close to 50k car from my drive way lol that's all thanks, I apologise is this is hard to read in working and texting it via my phone.