How We Engineered the Flush Mud Flap for the 2024 Tesla Model 3
A separate R&D project. A separate injection mold. One brief: full spray protection with a profile so low, most people won't notice it's there.
The Problem
Some Owners Want Protection They Can't See
Not every Model 3 owner wants the car to announce what it's set up for. For a lot of buyers, the appeal of a Tesla is how little visual clutter there is—clean bodylines, minimal badging, no chrome. Adding a visible mud flap breaks that silhouette.
The OEM answer is nothing. Tesla doesn't factory-fit mud flaps on the Model 3, and the aftermarket has mostly treated that as an invitation to bolt on the largest, most obvious flap they can. For a category of owners, that's the wrong direction.
"We kept hearing from customers who wanted spray protection but hated how visible mud flaps looked. That feedback became its own design brief—a separate product, not a smaller version of an existing one."
This flush mud flap was scoped from day one as an independent project: its own CAD, its own injection mold, and an outer geometry that follows the 2024 Model 3 bumper line so closely you have to look twice to see it's there.
Precision First
We 3D-Scanned for a Different Kind of Fit
A flush-style mud flap is actually harder to engineer than a visible one. The closer you trim the outer edge to the bumper, the less room you have for manufacturing tolerance. A 1mm error on a big mud flap is invisible. A 1mm error on a flush flap means a visible step in the bodyline.
We brought a Scantech handheld structured-light scanner to a 2024 Model 3 and captured the rear fender liner, quarter panel lip, and bumper interface at 0.02mm resolution. The goal wasn't just to clear the tire—it was to find the exact contour where the flap could end without leaving a visible gap.
The scan revealed a subtle outward curve on the lower rear quarter that most universal-fit flaps ignore. That's the line this flap's outer edge follows—tight enough to read as OEM from five feet away, loose enough to manufacture reliably at scale.
The Concept
We Chose Invisibility, On Purpose
The design brief read like a negative space problem: remove material until it's barely noticeable, but keep spray protection behind the tire where it actually matters. Every millimeter of outer shell got scrutinized—if it wasn't doing protection work, it got trimmed.
Bumper-Line Follow
The outer edge tracks the Model 3's rear bumper radius within 2mm. From the side, the flap reads as part of the body.
Minimal Visible Footprint
About half the visible surface area of a traditional mud flap. The parts that are visible match the factory trim's matte texture.
Full Behind-Tire Coverage
Where it matters—directly behind the tire—this flap is full depth. Spray protection isn't compromised for looks.
No Drilling Required
Locates onto the factory fender liner holes. One OEM-style screw per flap, hidden behind the wheel. 5 minutes per corner.
Trial & Error
Printed, Installed, Iterated
The prototypes came off the 3D printer with a different problem than most mud flaps face: the visible edge had to be essentially perfect. Each iteration was test-fitted against the scan data to track which revision solved which fit issue.
Round 1 — First Flush Attempt
Initial prototype's outer edge sat 3mm proud of the bumper line. Close by mud-flap standards, miles off by flush-fit standards. Back to CAD with a revised curve.
Round 2 — Edge Contour Match
Second revision matched the bumper radius to within 2mm. Test-fitted and caliper-checked against the scan data.
Round 3 — Invisible Mounting
Redesigned the internal backbone so it sits entirely inside the factory fender liner cavity. From outside: no visible screw head, just the flap's outer edge following the bumper.
Round 4 — Production Tooling
Cut the injection mold for the final geometry. First-shot production parts matched the scan data within 0.3mm at the visible edge—critical for the flush look to hold up under real production tolerance.
Verification
Flush-Fit Means Zero Visible Gap
CAD renderings look perfect. Real parts on real cars don't. For this product the validation bar was higher—because a flush flap that doesn't actually sit flush is worse than no flap at all.
"The success metric was simple: a stranger walking past the car should ask if you added mud flaps, not assume you did."
Materials
Why Soft-Flex TPE, Not Hard Plastic
| Component | Material | Why |
|---|---|---|
| Flap body | Soft-flex TPE (thermoplastic elastomer) | Absorbs stone impacts. Flexes on curb strikes. Stays pliable from −20°C to +80°C. |
| Mounting backbone | High-density TPE inner rib | Stiffer zone bonded into the same part—rigid where it bolts, flexible where it flaps. |
| Surface finish | Matte grain, UV-stabilized | Matches the factory trim texture so the flush profile reads as OEM. |
| Hardware | Stainless steel screws (OEM-thread compatible) | Won't rust. Threads into existing factory fender liner holes. |
We avoided hard ABS: it cracks on first impact. For a flush flap visible from the side, a crack isn't just a performance failure—it's immediately visible and ugly. TPE's return-to-shape behavior is critical here.
The Result
What You Actually Get
| Feature | What It Means for You |
|---|---|
| Bumper-line follow to within 2mm | From the side, reads as part of the factory bodyline. |
| Full spray protection behind the tire | Looks invisible, protects like a conventional mud flap. |
| 3D-scan-derived fit | No gap at the top. No proud edge. |
| No drilling | Factory fender liner holes. Under 5 minutes per corner. |
| Soft-flex TPE | Returns to shape after curb strikes. |
| Matte finish that matches factory trim | Flush profile reads as OEM—not aftermarket. |
| 4-piece full-car set | Front left, front right, rear left, rear right. |
| Fits 2024+ Model 3 (Highland) | Validated on the current generation. |
Common Questions
Frequently Asked Questions
Does this fit the old (2017-2023) Model 3 or only the 2024+ Highland?
How does this differ from the other Model 3 Highland mud flap you make?
If this flap is smaller, does it protect less?
Do I need to drill holes in my Tesla?
Will people be able to tell I added mud flaps?
Will they rattle or fall off?
Why TPE instead of ABS or rubber?
Ready to Upgrade?
Protection That Doesn't Look Like Protection
3D-scan-derived fit. Bumper-line follow. Full spray protection. Visible enough to work, subtle enough that most people won't notice.
Shop NowFits 2024+ Tesla Model 3 (Highland) · Free US Shipping
