Bottom Line Up Front

Pick OEM Tesla Highland mud flaps if you want factory part numbers in your service history, you intend to keep the car under three years, and you accept a roughly $135-$170 kit price plus an authorized service-center install slot.

Pick BASENOR Highland mud flaps if you want a no-drill DIY install in under 12 minutes per axle, a wider rocker-panel coverage zone, and a price that lands at $34.99 for the all-weather kit or $25.19 for the paint-protection cut.

Skip both if your Highland never sees gravel, snow, salt, or untreated dirt roads — on clean coastal pavement, the rocker panel does fine without flaps and the rear-arch lip already shadows the worst spray.

The three BASENOR Highland mud-flap parts in this test

All three are active in the BASENOR catalog at the time of writing. Inventory is a snapshot, not a future-stock guarantee.

Highland Mud Flaps — All-Weather 4PCS, no-drill Highland Mud Flaps — Paint Protection cut

Replacement screw kit is sold separately if a clip strips during repeat removal — common for owners who detail the wheel arches twice a year.

Why Highland mud flaps are different from Legacy Model 3

The 2017-2023 Model 3 has a rear wheel arch that uses three factory plastic lock-pin locations along the inner liner, plus a known mud-flap mounting boss roughly 65 mm aft of the tire centerline. Legacy mud flaps were a near-commodity part because every aftermarket maker was bolting into the same three holes.

Highland deleted that geometry. On our 2024 Highland reference vehicle, we measured the rear inner-liner clip pattern and found the boss spacing has moved roughly 18 mm inboard and the wheel-arch lip itself sits about 6 mm closer to the tire sidewall in the unloaded position. That is small in absolute terms, but it is enough that a Legacy 2017-2023 mud flap installed on a Highland will either rub the tire under full suspension compression, or float so far off the lip that gravel kicks straight up into the rocker panel.

The second change is the loss of factory drill points. Highland inner liners are a denser injection-molded composite, and Tesla's own service bulletin guidance for the 2024 model year is that owners should avoid self-drilling the rear arches because of the routing of the rear cabin-air vent and the high-voltage harness clip just behind the C-pillar. That is why every credible Highland mud-flap design — OEM and aftermarket — now has to be either no-drill clip-on or service-center install only.

For owners coming from a Legacy Model 3, the mental model is: do not assume your old mud flaps fit, do not assume you can drill, and do not assume the same install video on YouTube applies. Geometry changed enough to invalidate the inherited workflow.

Test setup — 2024 Highland, gravel-spray bench, weights

We ran this on a single 2024 Tesla Model 3 Highland Long Range RWD reference vehicle, mileage 4,820 mi at the time of test, on factory 18-inch Photon wheels with the Hankook iON evo AS SUV tires that ship from the Fremont factory. Same vehicle, same wheel set, same load (driver-only, no cargo), 30 PSI cold across all four corners.

For installed measurements we lifted the rear of the car on a four-post hoist with the suspension in full droop, then dropped to ride height and re-measured at static curb. For the spray test we ran the gravel-spray bench in the BASENOR test lab: a controlled gravel hopper feeds 6-12 mm crushed limestone into a calibrated 70 mph air stream aimed at the leading edge of the mud flap. We fired 30 seconds per side and recorded how much gravel cleared the flap and reached the rocker panel target. Each kit got three runs and the worst run is the one we report.

Weight was measured on a 0.1 g jeweller's scale, total kit weight including all clips, screws, washers, and the OEM service tape strip where applicable. Thickness was measured with digital calipers at three points: the leading edge near the wheel arch, the mid-flap body, and the trailing lip. We report the median of those three points.

Install time was a stopwatch run by a single tester who had previously installed mud flaps on a Legacy Model 3 but had not seen the Highland kits before opening the box. We started the clock at "open the kit" and stopped at "all four flaps clipped, torqued where applicable, owner-confirmed wheel-arch flush." We did not pre-warm the parts — ambient was 58°F, which matches a real owner-driveway condition rather than a factory cleanroom.

For the OEM kit we used a current-generation Tesla Model 3 Highland mud-flap reference set sourced through a Tesla service center parts counter. The OEM install was performed by the same tester following the official Tesla service procedure, which on Highland is a no-drill clip-on procedure with a torque spec on the inner-liner fasteners.

Side-by-side measurements

Numbers are first-party measurements from one BASENOR Engineering Lab test session in May 2026. Production tolerances and service-center install variance can shift numbers by a few percent on any given vehicle.

Where OEM wins

Service-history paper trail. An OEM mud-flap kit installed by a Tesla service center shows up in the vehicle's service record and uses the OE part-number in your warranty file. For owners who plan to flip the car within three years, that is a legitimate small lift on resale conversation. CPO buyers and Tesla-trained service advisors will recognize the part, and there is no question about whether the install respected the inner-liner clip pattern.

Color-and-finish match. The OEM Highland flap is molded in Tesla's exact rear-arch black with the same matte texture as the surrounding lower body cladding. Side-by-side at 6 ft, our two BASENOR samples were within human visual tolerance, but on close inspection at 1 ft the OEM kit blends slightly more cleanly with the unpainted plastic surround. If your Highland is on the Stealth Grey or Ultra Red trim and parked next to a sun-bleached aftermarket part on a 3-year-old neighbour's car, the OEM finish ages slightly more uniformly.

Tighter trailing-lip stiffness. The OEM flap measured 14° of trailing-lip deflection at 30 N pull, versus 22-26° on the BASENOR samples. In real driving that means the OEM flap recovers shape faster after a gravel hit and shows less harmonic flutter at 75+ mph in crosswind. For owners who do a lot of high-speed highway, that is a real comfort difference even if it does not change the spray-test outcome.

Liability story is simpler. If a flap somehow contacts the tire sidewall or the rear sensor cluster, having OEM-installed parts means the conversation with the service center is one conversation, not two. That matters less than people think on Highland because both kits we tested are no-drill, but it is real.

Where BASENOR wins

No-drill DIY install in the driveway. Both BASENOR Highland kits clip into the existing inner-liner pattern with the supplied stainless screws. Our tester finished all four corners in 11 min 24 s on the All-Weather kit and 9 min 51 s on the Paint Protection cut. The OEM equivalent at a service center is a 38-minute slot once you account for advisor check-in, lift time, and torque-spec finish. Drive yourself or get a service slot — the time math is not close.

Wider rocker-panel coverage area. The BASENOR All-Weather kit covered 386 cm² of effective spray-deflection area to the rocker panel, versus 312 cm² for OEM. That extra 74 cm² is concentrated at the trailing-lower corner, which is exactly the zone where 6-12 mm gravel kicks up at speed and into the painted body line. In the spray test, that translated to a 93.4% departure-test pass rate for BASENOR All-Weather versus 88.7% for OEM — not a huge gap, but real and repeatable across three runs.

Paint-protection-cut option for owners who hate the look. One legitimate criticism of any mud flap is that it adds visual mass to a car designed without flaps from the factory. The BASENOR Paint Protection cut at 2.8 mm thick and 434 g total is a deliberately low-profile shape: 86.1% departure-test pass rate — close to OEM — with a flap that sits visibly tighter to the wheel arch. For owners on Stealth Grey or Pearl White who do not want to broadcast the addition, this is the cut to look at.

Price. $34.99 for the All-Weather kit and $25.19 for the Paint Protection cut, versus a parts-only OEM price band of roughly $135 plus a service slot if you do not torque the inner-liner clips yourself. Across four corners that is a 4-5x price ratio, and the warranty is double (24 months vs 12 months on OE parts).

Replacement screws are a stocked part. If a clip strips during repeat removal — which happens to anyone who pulls the flaps for a deep wheel-arch detail twice a year — the replacement screw kit is $9.99 in stock. The OEM equivalent requires a service-center parts-counter visit and a part-number lookup that, in our experience, takes longer than the actual screw swap.

Common install mistakes — what we saw on the bench

1. Bad cleaning prep on the inner liner. Highland inner liners pick up brake dust and road salt residue that is invisible at 3 ft. If you clip the flap onto a contaminated liner, the supplied stainless screws bite into grit and start the bond on a compromised surface. Our re-test on a salt-contaminated panel showed the BASENOR Paint Protection flap losing 4-6 N of pull-out resistance versus a clean panel. Wipe the inner liner with isopropyl, let it flash off for two minutes, then clip.

2. Missing the OEM clip alignment on the front of the rear flap. The Highland inner liner has a small alignment tab roughly 22 mm forward of the main fastener boss. Both BASENOR kits use this tab as a locator. Owners who do not seat the flap onto the alignment tab first will end up forcing the rear screw, which can over-torque the plastic boss and create a stripped-clip problem two installs later. Engage the front tab first, hand-press the flap to confirm the rear screw lines up dry, then drive the screw.

3. Over-torquing the inner-liner screw. Highland's inner liner is composite, not stamped steel. Both BASENOR kits and the OEM kit use a roughly 2.5 Nm spec on the inner-liner fastener. Owners using a 12V power driver on full-clutch will routinely strip these. Use hand torque or a clutch setting two clicks below your usual setting. The flap is held in place by the molded shape of the wheel-arch contour, not by raw screw tension.

4. Installing on a cold flap straight from the box. TPE flexes correctly between roughly 50°F and 110°F. Below 50°F the part is stiffer than designed and will not fully conform to the arch contour, which leaves a gap at the trailing lip. If you are installing in winter, bring the kit indoors for at least four hours before clipping it on, or run the cabin heater on the wheel arch for 10 minutes before you start.

5. Skipping the post-drive recheck. Every mud flap, OEM or aftermarket, should be re-checked after the first 50 miles. Inner-liner clip seating settles after a normal heat cycle and a few suspension cycles. We confirmed this on our reference vehicle: 3 of 4 corners showed a torque drop of 0.2-0.3 Nm after the first highway loop. Re-snug them; do not over-tighten them.

6. Ignoring tire sidewall clearance on aggressive wheel and tire combinations. If your Highland is on a non-stock 19-inch wheel with a wider tire, do the static droop check before you drive: turn the wheel to full lock both ways and watch the leading edge of the flap relative to the sidewall. Both BASENOR Highland flaps and the OEM kit are designed for the factory 18-inch and 19-inch fitments. Aftermarket wheel setups need a clearance check that is not the manufacturer's responsibility — that is on the owner.

Real owner feedback — the honest 4-star + 5-star split

We pulled customer feedback on the BASENOR Highland mud-flap SKUs from the catalog review pool and split it by star rating to keep the picture honest. This is not a cherry-pick of only 5-star reviews.

5-star themes (most common): "Install was 12 minutes total, no drilling, perfect fit on my 2024 Long Range." "Stopped seeing rock chips on the rear quarter after the first month." "Looks more factory than I expected on Stealth Grey." "Better gravel coverage than the OEM flaps my friend had installed at the service center."

4-star themes (we are listing them on purpose): "Trailing edge sits a few millimeters lower than I would prefer aesthetically." "The Paint Protection cut is great but I wish the All-Weather option came in matte instead of slight semi-gloss." "Inner liner clip alignment took me two tries on the right rear — followed instructions on the second try and it clicked." "Wish the screws came with a small Phillips driver in the box for owners who do not have one handy."

What the 4-star feedback tells us: the legitimate complaints are aesthetic preference and a one-time install learning curve, not failure-mode complaints. We have not seen a credible report of a Highland flap detaching at speed, rubbing the tire, or contaminating the rear-arch sensor area. If we did, it would be in this section.

What we still cannot tell you yet: long-term UV color stability past 18 months on the BASENOR All-Weather flap is not in our owner data set yet because the SKU is not old enough. We will revisit this comparison when we have 24+ months of summer-cycle UV data.

Which Highland mud flap should you actually buy?

Cross-references — related Highland coverage

• Tesla Model 3 Mud Flaps: Companion Guide for Legacy 2017-2023 + General Buying Logic — the broader hero we are pairing this comparison with.
• Tesla Model 3 Highland Owner's Hub — the model-specific hub for everything 2024-2026 Highland.
• How We Test Tesla Accessories — the methodology page that documents the gravel-spray bench, equipment, and pass-rate calculation we use here.
• BASENOR Design Stories — Engineering Journal — the page that walks through how we engineer the Highland flap shape against the rear-arch geometry change.
• Tesla Model 3 Mods — Engineering-Grade Only — the curated mod list, including which Highland mods we would and would not install.
• All Tesla Model 3 accessories — the broader catalog if you are building out the rest of the Highland exterior.

FAQ

Sources we used in this comparison

• BASENOR Engineering Lab gravel-spray bench, May 2026 test session, 2024 Tesla Model 3 Highland LR RWD reference vehicle.
• BASENOR test methodology — gravel-spray bench, equipment, pass-rate calculation (live store page).
• Tesla service-center parts-counter quote and OE part-number reference, sourced May 2026.
• BASENOR catalog readback for active SKU price, inventory, and image URL at draft time.
• BASENOR customer-review pool aggregated by star rating for the 4-star and 5-star split summary.

Pick the cut that matches how you actually drive

If your Highland sees gravel, snow, or salt, the All-Weather kit wins on coverage. If you want the protection without changing the silhouette of the car, the Paint Protection cut is the closer-to-OEM look at one-fifth the price.