I know everyone has different opinions on what is new and what is used. To me, a new car has less than 20 miles on it. My 18 GT had eight miles on it when I drove it off the lot.
There are dealers that add on basic mods and up charge. I have seen wheel/tire packages as well as cat-backs and intakes. Most have been Roush sourced. Saw one that did a Niche 20inch wheel/tire and Roush axle-back and tacked on $5k to the MSRP. (smh)
Come on that dealer went out of their way to add parts that you want, and broke it in for you. That to me is premium service and they deserve your money.