STILLEN 2016-2023 Nissan Maxima Midpipe - Axle-Back to Cat-Back Conversion - 504391

The STILLEN Mid-Pipe Conversion for the Nissan Maxima [A36] allows owners of STILLEN axle-back exhaust systems to upgrade to a full cat-back configuration for increased performance, improved exhaust flow, and a more aggressive exhaust tone.

Constructed from mandrel-bent 304 stainless steel, this mid-pipe assembly includes a Y-pipe and integrated resonator, engineered to enhance horsepower and torque while maintaining a refined sound profile with no excessive drone. The system is designed to complement the factory exhaust cut-outs and integrates seamlessly with existing STILLEN axle-back exhaust systems.

Using STILLEN’s extensive experience developing performance exhaust systems for Nissan’s VQ35 3.5L V6, this mid-pipe conversion improves exhaust scavenging, reduces backpressure, and increases overall efficiency. Installation is fully bolt-on with no cutting or fabrication required.

Vehicle Fitment

Nissan

• 2016–2023 Nissan Maxima [A36]

Required Exhaust Compatibility

• Fits 2016–2018 STILLEN Axle-Back Exhaust – Part #504399
• Fits 2019+ STILLEN Axle-Back Exhaust – Part #504403

Fitment Notes

• Converts compatible STILLEN axle-back systems into a full cat-back exhaust
• Not a standalone exhaust system
• Designed specifically for STILLEN axle-back exhausts listed above

Features & Benefits

• Increases Horsepower at the Wheels
• Increases Torque at the Wheels
• Enhances exhaust flow and scavenging
• Compliments factory exhaust cut-out design
• Y-Pipe and Resonator Included
• Mandrel-Bent 304 Stainless Steel Construction
• Improved exhaust tone without harsh drone
• Bolt-On Installation – No Cutting Required
• Built for long service life and durability

Construction & Design

The STILLEN Maxima mid-pipe is manufactured from high-grade 304 stainless steel and features mandrel-bent tubing to ensure consistent diameter and unrestricted exhaust flow. The included resonator is tuned to reduce unwanted frequencies while maintaining an aggressive, sporty exhaust note under throttle.

This mid-pipe integrates directly with compatible STILLEN axle-back systems to form a complete cat-back exhaust solution.

Upgrade Potential

For maximum performance and sound, STILLEN recommends pairing this mid-pipe conversion with:

• STILLEN Axle-Back Exhaust
• STILLEN Cold Air Intake
• STILLEN Aero Components (Rear Diffuser, Front Splitter, Roof Spoiler)

Why STILLEN

Since 1986, STILLEN has specialized in Nissan and Infiniti performance development. With deep motorsports roots and close ties to Nissan and NISMO, STILLEN products are engineered, tested, and manufactured to deliver proven results in real-world driving conditions.