Project Budget 400WHP S197 Mustang Track Car: Part 8 – Aero with Steeda and Ford

Install 2013 Boss 302 Chin Spoiler RareFabThe guys at RareFab made quick work of the install, which was pretty easy since this is an OEM piece designed to be used on an OEM bumper.

2013 Boss 302 chin spoiler installThe splitter is first to be installed, with 18 screws that attach it to the bumper cover.

2014 Boss 302 chin spoiler splitter mountsAt the back of the splitter in the wheel wells are 2 screws on each side. We added washers to further distribute the load across the panel.

2014 Boss 302 Chin spoiler splitter under panelAfter the splitter was done, we installed the lower belly pan.  This further cleans up the airflow under the car.

Boss 302 Chin spoiler splitter underFrom this angle, we can see the lower profile of the splitter as well as the small integrated air dam that protrudes half an inch below the splitter to direct air around the front tires to further reduce drag a little.

2014 Boss 302 chin spoiler splitterFrom above, we can see the splitter extending further forward on the outer edges of the bumper where there is less of a high pressure area than the center of the bumper.

Quick Reference:

Page 1 – Overview
Page 2 – Boss Splitter Install
Page 3 – Installed Boss Splitter Review
Page 4 – Remove Stock Spoiler
Page 5 – Clean Decklid & 3D printed Adapter
Page 6 – Mount Steeda Wing
Page 7 – Review and Aero Insight


  1. Another good Billy Johnson article. If the used car market wasn’t so insane, I would be all over a ’13-14 Mustang and follow all your advice to modify it. I have only ever had miatas on track, so some power would be a nice change.

    1. Based off of the goals for the project to be a budget track car that’s also driven on the street without beating you up, and from my experience racing the S197 (with this aero) the Steeda spring and bar rates were chosen accordingly. Stay tuned for when I track test and evaluate this setup!

  2. Great articles, Billy! I can’t believe I came across this one just as I am trying to reproduce the aero package of the GS cars ever since I saw them at COTA in 2013. Most people like the WC cars, but I have a heart for endurance racing and I always wanted to duplicate the 302R. Anyway, I bought the Steeda wing years ago, but am only just now getting around to figuring out the mounting “shim.” I have contacted many of the race builders and nobody seems to have any left in a box on a shelf somewhere. I thought it would be awesome if somebody could just 3D print them and now – you have gone and done just that! Uh, any chance you can share that file? Any help would be appreciated. My website link goes to my write-up of the 2013 COTA race with a couple of pretty good pictures of your car.

    1. Would be even nicer if Billy could print up a half dozen or so of these at a time and make them available to purchase cor those of us with no 3D printing abilities.

  3. What is the part# of the Steeda wing you used? I looked on Steeda’s website and did not see this wing. They may not have the correct photo posted.
    The 3D printed adapters would be slick.

  4. I am getting ready to do the same things to my 2006 Mustang GT. Please let me know if you have the adapters available. Thanks for the article!

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