Exterior Components› Body Panels and Components

STILLEN

Rear Diffuser

$425.67

SKU: KB11222MB

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The STILLEN KB11222MB is a rear diffuser designed for the 2014-2017 Infiniti Q50. It is constructed from durable polyurethane and comes painted in a matte black finish, ready for direct installation.

The diffuser features an aerodynamic, race-car inspired design that enhances the rear end appearance of the Q50. It includes oversized exhaust cutouts to accentuate the exhaust system and offers the strength to withstand daily street use. Installation is straightforward with pre-installed 3M automotive tape and requires no cutting or modification to the bumper.
Show original supplier description
The STILLEN KB11222MB rear diffuser is designed to transform the aesthetics of your 2014-2017 Infiniti Q50. This diffuser features a race-inspired design with aggressive strakes and oversized exhaust cutouts, aiming to provide a sophisticated and sporty look. The matte black finish is ready for installation as-is, or it can be prepped and painted to match your desired color scheme. Installation is designed to be a no-hassle process, utilizing pre-applied 3M automotive tape and requiring no cutting or modification to the vehicle's bumper. It is removable should you wish to revert to the stock look. Beyond its visual enhancements, the STILLEN rear diffuser is designed and manufactured in-house at STILLEN, ensuring high standards of quality and fitment. The polyurethane construction offers superior strength to better survive the hazards of daily-driven street use, while the aerodynamic design aims to create a sophisticated look.

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

Don’t gamble
on fit.

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

Available on iOS & Android

Specifications

BrandSTILLEN
Part NumberKB11222MB
CategoryExterior Components

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

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.

View Full Return Policy

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.

View Full Shipping Policy