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Exterior Components› Body Panels and Components

Stillen

Polyurethane Rear Diffuser

$327.53 $252.33 Save $75.20

SKU: KB12818-STILL

Out of Stock
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

Constructed from polyurethane, it offers an OEM-like fitment for a clean, seamless look. Polyurethane is a more pliable material, making it less likely to chip or crack compared to fiberglass. The diffuser is available in raw urethane or painted matte black.
Show original supplier description
The STILLEN Rear Diffuser is constructed from sturdy and resilient polyurethane, ensuring durability and an OEM-like fitment for a seamless appearance on your 2016-2018 Nissan Maxima. Unlike fiberglass, polyurethane is more pliable and less prone to chipping or cracking. This diffuser comes with 3M automotive trim foam tape pre-installed for a fast and easy installation, requiring no cutting or modification to the bumper and is easily removable. It features fins and deep air channels that visually widen the rear bumper, creating a sporty aesthetic and drawing attention to the exhaust area. While not a functional racing component, it significantly enhances the visual appeal of the sedan. This product is available unpainted, ready for priming and painting to match your vehicle's custom look. It's important to confirm fitment with the seller before placing an order to reduce the risk of receiving the wrong product. In cases where the sales team has recommended an incompatible setup or made an error, the item can be returned in like-new condition with no restocking fees.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandStillen
Part NumberKB12818-STILL
CategoryExterior Components
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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