Exterior Components› Body Panels and Components

Stillen

Rear Diffuser

$279.62

SKU: KB13158

Special Order
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Overview

The Stillen Rear Diffuser is an exterior styling component designed for the 2016-2018 Nissan Altima. It offers race-inspired styling to create a track-ready appearance and gives the rear bumper a sporty look. This diffuser highlights and accentuates the factory exhaust cutouts.

Constructed from polyurethane, it comes pre-installed with 3M automotive tape for a secure fit. The installation requires no cutting or modification to the bumper and is removable. This part is sold unpainted and requires prepping, priming, and painting by the end-user. It is backed by a Limited Lifetime Warranty.
Show original supplier description
The Stillen Rear Diffuser is engineered to give the 2016-2018 Nissan Altima a more aggressive, track-inspired aesthetic. It aims to enhance the overall styling of the L33 Altima, moving away from a more conventional look towards a performance-oriented stance. Crafted from durable polyurethane, this rear diffuser is pre-fitted with 3M automotive tape, ensuring a straightforward installation process similar to OEM standards. Crucially, it requires no cutting or permanent modification to the existing bumper, allowing for easy removal if desired. The unpainted finish provides a clean slate for custom painting, allowing owners to match it precisely to their vehicle's color scheme or a unique custom design. This aerodynamic function contributes to the car's performance appearance. For an even more integrated look and sound, Stillen suggests complementing the rear bumper diffuser with their Stainless Steel Axel-Back Exhaust System. This product comes with a Limited Lifetime Warranty, underscoring Stillen's commitment to quality and durability. It is specifically designed for the 2016-2018 Nissan Altima [L33] models.

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

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Specifications

BrandStillen
Part NumberKB13158
CategoryExterior Components
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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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