Those fender stripes on the blue look fantastic.

 

No harm in going vinyl
I like my vinyl stripes just fine

 

I would say go with vinyl. its always reversible. Paint it a little too final for me. If you ever want to change the look...or sell the car to someone that doesn't like stripes its an easy change. I have vinyl stripes and they hold up with no problems at all.

 

You could try google images, and get hundreds of pictures of a Kona Blue Mustang with stripes.

 

Vinyl is good, but man oh man does it not hold up to road wear.

 

Is it the deep impact blue (DIB)? If you head over to the Mustang Customizer on Ford's site, you can get a good feel for how the different stripe options and colors work on DIB.

For example, I'm between white and black at the moment, but leaning toward black.



Also I've had vinyl stripes on my last mustang (in sig) for almost 9 years. It had a few chips, but never peeled.

 

DIB is a 2013+ color. If his car is dark blue, it's Kona Blue (significantly darker than DIB).

 

Here is how my 2014 in deep impact blue turned out.

 

Stock California Special Lip it looks like.

 

I have the kona blue with the white wide center stripe (23 inches) and pin stripping on the sides, in the climate here the vinyl is not holding up (2 years and peeling and cracking). White looks awesome on the blue, but ASAP I am going to paint on the brightest silver I can find instead.