I agree if it's staying on the strip then what you have is good and not worth up grading. As far as looks are concerned I would loose that luggage rack on the trunk and maybe put a low profile wing on. I would also loose those louver rear tail lights very late 80's or early 90's look. Some LED tail lights maybe clear lenses or something. Same goes with the front the bra and front head lights. I would also just put the roll bar in while you're doing all that work. I would also attack the car and drop everything I could saving weight. I think done properly a rear seat delete can look real cool on mustangs I was planning mine when I sold my mustang. Don't underestimate how much upgraded tail and head lights can change the look of a car. Thats all I got for now good luck bro