RULLINE 33.5" x5.2" Universal Rear Bumper Lip Diffuser Car Rear Bumper Chassis Black Spoiler Shark Fin 7 Wing Glossy Black ABS

🏁 RULLINE Universal Rear Bumper Diffuser — Shark Fin Style Meets Street Aero

Give your ride that track-inspired rear end with the RULLINE Universal Rear Bumper Diffuser (33.5″ x 5.2″). Designed with seven shark-fin wings and finished in glossy black ABS, this rear lip spoiler delivers the perfect blend of aerodynamic function and aggressive styling — all in a universal fit that suits most sedans, coupes, and hatchbacks.

【Reduce Air Resistance】:This shark fin diffuser designed to increase a vehicle’s aerodynamic performance.Reduces car’s drag about 1.6% and increases down force.Reduce the airflow into the bottom, improve the steady of vehicle during fast driving.

【Excellent Appearance】:Shark fin and clean lines design, beautiful appearance, personalize and update your car, stylish design gives a customized look.Give your vehicle a more aggressive racing look.

【ABS Material】 :Made of high Quality ABS, waterproof, lightweight but durable, not easy to break.

💨 Why the RULLINE Diffuser Belongs on Your Build

Because airflow matters — and attitude sells it. The RULLINE rear bumper diffuser doesn’t just look fast; it reduces turbulence, smooths airflow, and adds downforce at speed. The result is better stability, improved aesthetics, and a rear profile that demands attention.

【Universal Fit】:Universal fit for most cars like Acura Honda Toyota BMW Chevrolet Ford etc, please measure your vehicle before purchasing.Dimensions

【Easy Installation】:Install with screws (need drilling holes) or with adhensive double sided tape, but professional installation is still recommend.

Key Features:

Universal fitment for most cars, trucks, and SUVs

Seven shark-fin blades for true motorsport styling

Glossy black finish for a premium, high-contrast look

High-strength ABS construction — lightweight and durable

Improves aerodynamics and airflow under the chassis

Adds protection against road debris and scrapes

This is the perfect finishing touch for builds running front lips, side skirts, or rear canards — completing your aero package with race-bred symmetry.

From the brand

⚙️ Built Tough for Real Roads

Constructed from automotive-grade ABS plastic, the RULLINE diffuser resists cracking, warping, and fading. The UV-resistant gloss coating keeps it looking showroom-fresh, even after daily driving or weekend track runs.

Dimensions: 33.5″ (Length) × 5.2″ (Width)
Finish: Glossy black
Material: Lightweight ABS plastic

Compatible With: Most sedans, coupes, and compact SUVs with flat or mildly curved rear bumpers.

🔩 Simple Installation

The RULLINE diffuser installs quickly using pre-drilled holes and mounting hardware. Professional installation is recommended for a perfect flush fit, but experienced DIYers can bolt it up with standard tools.

Pro Street Tip: Space your fins evenly and align the centerline with your exhaust tips for that perfect symmetrical, factory-plus look.

Product description

US-SSW005

Step 1

Wipe clean the installation location

US-SSW005

Step 2

Tear off the double-sided adhesive film

US-SSW005

Step 3

Align the position to install, click

US-SSW005

Step 4

Install the screws more firmly

🔥 The Perfect Aero Upgrade for Any Build

This diffuser brings instant presence — it’s subtle enough for daily drivers yet bold enough for show builds. Pair it with a front lip splitter, side skirt extensions, or canards for a complete aerodynamic transformation.

SEO cluster: rear shark fin diffuser, glossy black bumper lip, universal aero spoiler, ABS car diffuser kit, rear chassis splitter.

🏆 Final Verdict

The RULLINE 33.5” x 5.2” Universal Rear Bumper Diffuser Shark Fin Spoiler gives your car the look of a supercar without the supercar price tag. Durable, aerodynamic, and aggressively styled — it’s the easiest way to finish your build strong.

[👉 Shop the RULLINE Universal Rear Diffuser Now at Pro Street Online]
Sharp lines. Smooth airflow. Pro Street attitude.

Specification: RULLINE 33.5″ x5.2″ Universal Rear Bumper Lip Diffuser Car Rear Bumper Chassis Black Spoiler Shark Fin 7 Wing Glossy Black ABS

Installation Type	‎Peel & Stick, Screw-In
UPC	‎763383254643
Item Weight	1.1 pounds
Package Dimensions	‎34 x 7.5 x 2.4 inches
Item model number	‎US-SSW005
Is Discontinued By Manufacturer	‎No
Manufacturer Part Number	‎US-SSW005
Voltage	‎12 Volts
ASIN ‏	B075WNJK2S
Date First Available	September 24, 2017
Manufacturer	‎RULLINE

Dimensions

Weight	0.498951 kg
Dimensions	86.36 × 19.05 × 6.096 cm

8 reviews for RULLINE 33.5″ x5.2″ Universal Rear Bumper Lip Diffuser Car Rear Bumper Chassis Black Spoiler Shark Fin 7 Wing Glossy Black ABS

4.0 out of 5

★★★★★

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★★★★★

Sean Sullivan – April 15, 2022

Product is a quality plastic that is very durable. I had to cut into the middle fin in order to fit this around my fuel tank’s hitch(?). I have a 2004 Honda Accord EX sedan and had to cut down the stock bumper lip for proper fitment. This product looks great and took all of a 2 hours to install because I was triple checking my measurements. I didn’t use the 3M adhesive supplied because I was able to use the bolt holes that the original bumper uses to bolt to the frame. This is currently held in by two 9mm plugs that are extremely secure. Overall, this product will most likely require custom fitment but is capable of being manipulated while keeping its durability!

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★★★★★

Scohen – June 11, 2025

Great quality adds sportiness to my car.

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★★★★★

BP – March 29, 2024

Fit well and looks good

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★★★★★

mark russo – September 29, 2025

Great.

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★★★★★

George Arthur – April 7, 2024

Cool idea, cool addition to a car. Except this product is cheap for a reason… it’s garbage.The diffuser arrived warped. It’s hard plastic, and it’s warped and bent. It’s impossible to straighten out. When attached to the car, most of it won’t stick with the worthless adhesive, and because it arrives warped, it looks ridiculous.The included screws are garbage and don’t hold. All they do is pull the plastic away and even with pre-drilled holes, it’s just a waste of your money.It looks ridiculous when it’s screwed on and warped.Either spend more money on a higher quality product, or just skip this idea. Otherwise, you’re going to return it like I did, with holes in your bumper.

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★★★★★

Willy Leon – September 14, 2025

Le quedó muy bien amo honda civic LX

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★★★★★

moutwtrng – August 19, 2023

Nice item. A little on the thinner side but plastic feels durable. I bought this for my wife’s 2023 Tiguan to cover that gaping hole in the bottom of the car. First the bottom of the car is flat and this is actually curved so it won’t sit flat. I had to cut it a tiny bit on the front as it sticks out on the back. In the end I was still able to make it work but does not really fit my needs…

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★★★★★

Jeremy Cooper – October 8, 2023

Ok so I was impressed as soon as I opened the package. The diffuser had some weight to it and felt reinforced. A lot thicker and stouter than I was expecting which is good. It has 2 slight curves, front to back and up and down so it contoured to my bumper great. After getting taped into place and marked for placement I pre drilled all the mount holes and installation was easy. I actually upgraded the double sided tape to a 1” 3M tape I had but the tape provided looks like it would have worked too. The diffuser now gives a little extra character to otherwise ordinary bumper. I am very happy with the way it turned out. Thank you

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