STILLEN 2016-2018 Nissan Maxima Rear Diffuser [Matte Black] - KB12818MB

Give your 2016–2018 Nissan Maxima (A36) a bold, performance-driven rear-end upgrade with the STILLEN Matte Black Rear Diffuser (KB12818MB). Designed to complement the factory body lines, this diffuser delivers an aggressive motorsport-inspired appearance that enhances the Maxima’s unmistakable 4-Door Sports Car (4DSC) identity.

Featuring deep air channels and aggressive fins, the diffuser visually widens the rear bumper while drawing attention to the factory exhaust cutouts. The design was developed alongside the STILLEN Stainless Steel Axle-Back Exhaust System, ensuring a cohesive, factory-plus look that feels purpose-built rather than aftermarket.

Constructed from durable, impact-resistant polyurethane, the KB12818MB diffuser installs without cutting, trimming, or permanent modification. It arrives painted matte black from STILLEN and ready to install, making it the ideal choice for customers who want instant visual impact without the need for body shop prep or paint.

Installation is fast and secure thanks to OEM-grade 3M automotive trim tape pre-installed on the diffuser, along with included adhesion promoter and mounting screws for added peace of mind. The result is a clean, aggressive upgrade that installs easily and holds up to daily driving.

Backed by STILLEN’s nearly 30 years of aerodynamic and body styling expertise, this diffuser is protected by a Limited Lifetime Warranty, ensuring long-lasting durability and confidence.

Key Features & Benefits

• Race-Inspired Rear Diffuser Design – Aggressive fins and deep air channels
• Painted Matte Black Finish – Arrives ready to install
• Enhances Rear Bumper Appearance – Adds width, depth, and sporty aggression
• Highlights Factory Exhaust Cutouts – Complements OEM and STILLEN exhaust systems
• No Cutting or Modification Required – Fully removable installation
• Pre-Installed 3M Automotive Tape – Same OEM-grade adhesive used by manufacturers
• Polyurethane Construction – Flexible, durable, and impact-resistant
• Limited Lifetime Warranty – Guaranteed against cracking or breakage under normal use

Vehicle Fitment

Compatible with:

• 2016-2018 Nissan Maxima [A36]

Why Choose the STILLEN Matte Black Rear Diffuser KB12818MB?

• Factory-painted matte black for instant installation
• Designed specifically for the 2016–2018 Maxima A36 chassis
• Complements STILLEN axle-back exhaust styling
• Aggressive appearance without sacrificing OEM fitment
• Easy, no-drill installation using automotive-grade adhesive and hardware