Low Cost / Good Looking DIY Splash Guards for FL5

s219

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I recently traded my ITS for a CTR FL5 and was not real happy with the selection of splash guards available for the car -- most of the aftermarket options are either expensive, amateurish looking (like some kid made them in high school shop), or both. So I made a set using the same approach I've used on several other sports cars over the years.

It starts with off-the-shelf Dee Zee DZ17939 "Universal Plastic Mud Flaps" which go for about $22 on Amazon (https://amzn.to/4n8t1rx) and can be bought at other stores like Tractor Supply and even Walmart.

11th Gen Honda Civic Low Cost / Good Looking DIY Splash Guards for FL5 IMG_1082 Medium


These are made from a flexible polyethylene material with a grained finish on one side and rounded/cupped edges. Just the slight 3D shaping and contoured edges is already an improvement over most of the aftermarket FL5 flaps that seem to have been designed with only flat stock and a ruler.

Step 1 in the process is to tear off one side of the box, trace the mud flap outline on the cardboard, and cut it out. That is the beginning of a template that I position into place until I get the fit, appearance, and coverage I want. After some trial and error, here is the final template I arrived at for the front wheel well on the FL5, along with a mud flap cut down and drilled to match:

11th Gen Honda Civic Low Cost / Good Looking DIY Splash Guards for FL5 IMG_1064 Medium


Generally, I can press on the cardboard template to mark out fastener locations on a car, whether they are screws, push rivets, or some combination. But the flat screws holding in the FL5 wheel well liner weren't real amenable to leaving marks in the cardboard, so I used a piece of aluminum foil to template the screw positions and transferred them to the cardboard. You can see on the template, I experimented with a few positions for each screw before arriving at the positioning that I liked.

Here's a few pics of the final product on the car:

11th Gen Honda Civic Low Cost / Good Looking DIY Splash Guards for FL5 IMG_1065 Medium


11th Gen Honda Civic Low Cost / Good Looking DIY Splash Guards for FL5 IMG_1066 Medium


11th Gen Honda Civic Low Cost / Good Looking DIY Splash Guards for FL5 IMG_1067 Medium


I went for a low profile look without much horizontal protrusion past the lower fender flare, but that can be adjusted to each person's taste -- there is plenty of flap material to go full rally style if you want. I did not cut out the opening for the aero vent as I have a gravel driveway and stone dust was coming through the opening and getting on the side skirts, however that would be easy to do -- a pencil can be used to mark out the openings on the cardboard template or flaps. I also did not make flaps for the rear wheels, as those have minor benefit in my experience, but the same approach would work well back there.

Note, in this application, the three factory screws were enough to securely hold down the flaps, and they were more than long enough to accommodate the added thickness. On other cars in the past, I've sometimes had to source longer screws or push rivets.

I'll post pics below of the same approach used on a Mazda Miata ND and BMW M2 Comp. Same approach different mounting fasteners. I also have put a set on an S2000 but don't have pics. On all these cars, I generally go as low profile as possible to provide necessary protection without looking obnoxious.

11th Gen Honda Civic Low Cost / Good Looking DIY Splash Guards for FL5 IMG_8507 Medium


11th Gen Honda Civic Low Cost / Good Looking DIY Splash Guards for FL5 IMG_2645 Medium


11th Gen Honda Civic Low Cost / Good Looking DIY Splash Guards for FL5 IMG_2641 Medium


I've had these flaps on the M2 for 6 years, and they still look great and have held up well. No fading or visible damage. Hard to beat for $22 and an hour of work!

I will post a PDF template for the FL5 in the next post.
 
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s219

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Here is a PDF of the FL5 template I arrived at, with my preferred screw holes marked out by arrows. I recommend drilling 1/4" holes for the screws, which will accommodate any slop in the template or mounting points on the car.

The PDF scan was split into two pages that can be aligned at the "match line" drawn on the template. I also included 1" reference marks so you can check scale after printing (it prints perfect 100% scale on my computer and printer here).

If someone uses this template but wants more generous horizontal protrusion, I would suggest adding an inch or more to the inside edge of the flap shape when you cut it out, and either offset my screw holes horizontally, or work out that detail yourself.

As mentioned above, if you want to keep the flow-through aero vents, you can use a pencil to trace out that opening with the template (or flap) on the car, then take back off and cut out the opening. This design will accommodate screen sandwiched between the flap and fender liner if desired. My day job is aerodynamics and I don't think the vents have much effect unless you're really driving at high speed and you require every last bit of downforce. I also think screens will create enough blockage to defeat the venting effect, so to me you either want them full open or close them up entirely to protect from debris.
 

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MrBBQ

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Great job, your DIY Guards look great! Thank you for sharing your idea and work. I would be all over this if I didn't already have the Rally Armor guards.
 

CivR

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They look very similar to the Zl1 Addons splash guards. Very clean and minimalist looking, looks great!
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