Every one of these posts is good advice.....something to be applied well into your life, not just for your wish to get a new Challenger.
There are many things you can to do achieve your goals in life that are financially sound - several of which have been mentioned in previous posts.
Don't rush into anything that will affect you long-term. Next to getting a mortgage on real property, a new car will be the biggest "planned" purchase you'll make. Give it the consideration it's due.