Would like black matte racing stripes on my black mustang, how to go about this?

I called up a local bodyshop and got a quote, it'd be 410 (installation fee+kit), however he said it'd be cheaper if I bought a ford kit online. I looked at the official ford site… And it's ridiculously expensive. However, I noticed on places like american muscle or ebay it's a lot cheaper. I'm just skeptical of the quality, is the thing. I don't want to do it myself because I barely have the time though it'd be a fun project, and I want it to look Really good.

Does anyone have any advice on going about this?

If you can get accurate measurements from an online source, there's one route you can go that won't cost but $30-$40 bucks and 1 Saturday worth of your time. Its called plastidip and comes in a spray can.It has the exact matte finish and appearance you're looking for too.Plus if you make a mistake, it will peel right off.Another online company that I believe makes stripe kits is Cervinis.com and its a very well known company with great parts.e.g.-A hood stripe kit for a 07-09 model is only $89 bucks. Its a very well liked company by the Mustang community.Another place you can check is your local sign company, if you have one. Not sure where you live but just check the online yellow pages for sign companies and vinyl sign companies. They can easily cut a stripe kit out for you. Just bring your car to them and they'll take measurements then start cutting.Shouldn't cost much at all.SignsNow is a well known company in my area of Nashville

Another route is a vinyl stripe. If you aren't exactly sure what you want, get a vinyl 'tape' strip. That way, if it just doesn't look right & you want to change the size/placement/color, you can peel it off with no paint damage & try another one. It will weather quicker, but after you get it perfect, you could have a body shop paint one permanently.