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Spoilers & Body Kits

4 Sporty Tesla Model 3 Rear Diffusers Guaranteed to Turn Heads

To make your car sporty, not much is required: side skirts, a front lip, a rear spoiler, and — to complete the kit — a Tesla Model 3 rear diffuser.

Sporty Tesla Model 3 (rear diffuser and spoiler). Credit to TheNumberOneD.

To help you turn heads on the streets — and visually back up your Model 3’s instant acceleration –, we compiled the best Tesla Model 3 rear diffusers available on the market today.

Who said an eco-friendly car can’t look sporty after all?

But first…

What is a Rear Diffuser Used For?

In short, a rear diffuser prevents a car from flying.

That’s a simple and unscientific definition, but it’s close to their practical purpose in a race track.

At high speeds, a rear diffuser increases the downforce of a vehicle, increasing its grip and reducing its aerodynamic drag.

With a vehicle as aerodynamic as the Model 3 (and with its low center of gravity due to battery weight), a wheelstand is unlikely to happen.

So in everyday life, its real purpose is aesthetics.

Race cars use it, and so, vehicles looking for a sporty appearance adopt it too.

If you have an engineering background like me, or have any interest in the physics principles behind the benefits of a rear diffuser, geek out with Engineering Explained:

Demonstration included @ 4:08.

Best Tesla Model 3 Rear Diffuser Overall: JC Sportsline A Style

JC Sportsline has been a carbon fiber manufacturer for many premium automakers since 2007.

Their carbon fiber rear diffuser comes at an extremely reasonable price — so much so I skipped the “best on a budget” product category for this buying guide.

According to buyers of this Tesla Model 3 rear diffuser, it’s relatively easy to install and fits perfectly without removing the bumper.

Watch the installation process and end result of this exact rear diffuser in VLADSWTF’s YouTube Channel:

Installation starts @ 1:45. End result can be seen @ 0:00 & 9:20.

The set includes screws and tape for quick installation out of the box,

But you may consider getting rubber washers, alternative fasteners, and some extra traceless double-sided tape to secure the rear diffuser in place without scratching your original bumper.

You may also want to raise your vehicle through car ramps if you plan on installing the diffuser yourself.

Given that is manufactured overseas, expect the product to be shipped within 2-3 weeks — and delivered somewhere closer to the 2-month mark.

For the quality and price, it’s worth the wait for most people.

Keep in mind: this Model 3 rear diffuser fits the 2016 to 2019 models, according to the manufacturer.

But looking in depth at the differences between 2019 Model 3 & the refreshed model (late-2020, 2021 and beyond),

The rear bumper design is the exact same.

I have yet to see a newer Model 3 with this diffuser installed, but I wouldn’t be surprised if this product fits the refreshed model just fine.

Pros:

Fits: Model 3 2016 – 2020
May fit refreshed model.

✅ Established brand

✅ Very reasonably priced for real carbon fiber

✅ Relatively easy installation

✅ Great fitting

Cons:

❌ May require extra installation tools

❌ Shipped from overseas

Runner-Up Model 3 Rear Diffuser: MCARCAR Diffuser + Splitter Carbon Fiber Kit (Flat Design)

With a thinner design and ribs that don’t protrude as downward, this MCARCAR kit offers an attractive look without the aggressive, in-your-face statement other diffusers make.

It’s perfect for Model 3 owners looking for a sportier appearance without drawing too much attention.

No screws or tape are included with this product, but our recommendation is always to use alternative fasteners and extra tape regardless.

The kit comes with both a centered diffuser and 2 outer splitters, protecting your rear bumper and giving it a full “anchor” appearance.

Whether you want to add the splitters to a different diffuser or you prefer the rear diffuser by itself, you can purchase them separately.

Like most rear diffusers, however, you’ll need to wait a couple of months to get your hands on it —

But as soon as you get it, install it and set your Model 3 apart from the rest.

The company has a 30-day money-back guarantee to back you up if you’re not satisfied.

Pros:

Fits: Model 3 2016 – 2020
May fit refreshed model.

✅ Sporty appearance without looking too aggresive

✅ Thinner design

✅ Comes with diffuser and splitters (can be sold separately)

✅ 30-day money-back guarantee

Cons:

❌ Shipped from overseas

❌ No installation tools included

Best-Looking Tesla Model 3 Carbon Fiber Rear Diffuser: JC Sportsline B Style

With much more pronounced and protruded ribs, the JC Sportsline “B Style” variant is perfect for those looking to stand out with the most aggressive of looks.

With a more attention-grabbing design, it comes at a premium compared to the “A Style” —

But it’s still priced conservatively, especially being authentic 3K weave carbon fiber (with an UV coating for longer expected life).

The product comes with tape and plastic screws for installation out of the box, but once again, you may consider additional tools for better results (e.g. stronger fasteners and higher-quality tape).

Expect long delivery times as well (2-month-plus).

As this diffuser protrudes downward to be more visually noticeable, ground clearance may be lowered more than usual — but that’s a small price to pay for the style it adds to your vehicle.

The brand also offers other Model 3 modifications like front lips, side skirts, and rear spoilers for you to complete your vehicle’s look.

Pros:

Fits: Model 3 2016 – 2020
May fit refreshed model.

✅ Aggressive look

✅ Great fitting

✅ Established brand

✅ Relatively easy installation

Cons:

❌ May reduce more ground clearance

❌ May require extra installation tools

❌ Shipped from overseas

Premium Pick: Unplugged Performance Ascension

The final Tesla Model 3 rear diffuser comes from a brand known for its performance-focused Tesla modifications: Unplugged Performance.

Looks are subjective, of course, and the first time I saw this rear bumper and diffuser kit, I reckoned, “There’s no way I’m going to recommend that…”

But I’ll be honest: the design grew on me as I looked at it more closely.

It gives the Model 3 a wider appearance that some owners will appreciate —

And in my opinion, it makes the rear looks closer to the Model S to some degree.

I’m not associated with Unplugged Performance in any way, but their name always comes up as I research Tesla performance and exterior aerodynamic improvements.

Thousands of Tesla owners in forums and other online communities rave about the quality of their products.

Quality doesn’t come cheap, though. Understandably so.

The company claims their products are made with the same “materials, equipment and in the same factory as million-dollar race car body panels.”

You’ll have to pay a premium when compared to the China-made alternatives on this list.

All the reasons above make this product our “premium pick” for Tesla Model 3 rear diffusers available today.

Pros:

Fits: All Model 3 years and trims.

✅ Replaces your rear bumper and cuts weight in half

✅ Aerodynamic and performance-focused brand

✅ Available in fiberglass and reinforced plastic as less expensive options

Cons:

❌ Expensive

Frequent Buyer Concerns:

  • Can I install a rear diffuser myself?

If you’ve dealt with car modifications before, you should have no problem installing the products described above (Unplugged Performance being the exception).

If you haven’t dealt with car modifications in the past (and aren’t willing to mess up with your Tesla), professional help is advised.

Call a local shop and make sure they’re okay with third-party products — as some only install the products that they sell.

  • Installing a rear diffuser requires require bumper removal?

As seen in VALDSWTF’s YouTube video, installation can be done without removing the bumper.

(With the exception of UP’s diffuser, which replaces the rear bumper.)

The manufacturers’ advice, however, is to remove the bumper for “better installation results.”

If you hire a professional, they should handle this without an issue.

But if you’re installing yourself, I suggest you try to install without removing the bumper first.

Chances are you’ll install the diffuser without problems.

  • Should I be concerned about range decreasing?

No.

In sports cars, the rear diffuser is used to increase downforce, improve grip, and make the vehicle more aerodynamic.

Carbon fiber rear diffusers like the ones above are also lightweight.

In theory, it should increase range if anything — although too little to make a difference.

In practice, you won’t notice any range or efficiency differences — positive or negative.

  • Will a rear diffuser improve performance?

Unless you’re driving at illegal high speeds and very low to the ground,

I wouldn’t expect any significant changes in performance (like 0 to 60 mph times) nor handling.

  • Will a rear dffuser remove ground clearance?

Although rear bumpers usually sit higher up than front bumpers,

A rear diffuser will decrease ground clearance by as much as an inch (or so).

Ground clearance in the rear area isn’t a big deal for most people, though, and scratches aren’t typically a concern.

Our Tesla Model 3 Rear Diffuser of Choice:

The “A Style” JC Sportline Tesla Model 3 Rear Diffuser gives your vehicle an aggressive look without being too over the top.

And the price is too reasonable to ingore.

Visuals are subjective but it looks pretty darn nice, too.

It will sure make your Model 3 stand out from similar models on the road —

And with a rear diffuser, you’ll have visual proof to back up of how fun electric vehicle are to drive (despite being seen as eco-friendly, boring appliances by many car enthusiasts).

Get yourself a sporty-looking rear diffuser and prove those gas-guzzlers wrong.

By Zac Ludicrous

Mechanical engineer by profession. TSLA shareholder before the hype. EV enthusiast all day long. Zac enjoys learning about the future of battery technology, autonomy, and EVs. He considers Tesla Model 3 the most important vehicle of the 21st century -- and is in a quest to improve the ownership experience of every Model 3 owner he possibly can.

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