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INFINITI

Cat Back Exhaust System

Name: Cat Back Exhaust System
Brand: INFINITI
SKU: 504451

$1,958.83 $1,482.16 Save $476.67

SKU: 504451

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Moderate — 2–4 hours

Overview

The STILLEN Cat Back Exhaust System is a performance exhaust designed for the 2016-2024 Infiniti Q50 3.0t. It is constructed from 304 stainless steel and features polished tips.

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The STILLEN Cat Back Exhaust System is engineered to significantly enhance the performance and sound of your 2016-2024 Infiniti Q50 with the 3.0t engine. Recognizing that the luxury focus of the Q50 involved compromises that restricted its breathing and power potential, STILLEN developed this system to streamline exhaust gas flow and remove restrictions. Through extensive R&D and multiple prototypes, STILLEN engineers achieved notable gains, unlocking an estimated 26.3 HP at 4,680 RPM and 29.5 lb-ft of torque at 4,680 RPM. The system features a 2.5" Y-Pipe for improved airflow, connecting to a 3" Mid-Pipe that then splits into a dual rear exit with 2.5" pipes. Constructed from durable 304 stainless steel, this cat-back exhaust system is built for longevity and features polished bolt-on exhaust tips. It is compatible with the OEM valance or can complement a STILLEN Rear Diffuser. The system also includes a Limited Lifetime Warranty. Fuel mileage gains can also be expected at cruising speeds due to the improved flow characteristics. This cat-back exhaust system is designed to fit 2016-2024 Infiniti Q50 AWD/RWD models equipped with the 3.0L Turbo V6 engine.

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

Brand	INFINITI
Part Number	504451
Category	Exhaust

Videos

Infiniti Q50 VR30 Stillen Cat Back Exhaust Install / Sound / Dyno

2019 INFINITI Q50 3.0L V6 w/ STILLEN CAT-BACK EXHAUST!

STILLEN Cat-Back Exhaust Installed on Infiniti Q50

2016-2021 Infiniti Q50 3.0t | STILLEN Cat-Back Exhaust | Sound Clips

Infiniti Q50 with Stillen Catback Exhaust Tunnel run (back)

STILLEN's Quick Guide | Exhaust Systems

Infiniti Q50 Cat-back Exhaust System (w/ Sound Clips) | 3.7L | STILLEN

Q50 Stillen exhaust and AMS test pipe Gains and Sound Test

2017 Infiniti Q50 S 3.0T Stillen Exhaust Sound Clip

Infiniti Q50 & Q60 VR30DDTT | STILLEN Cat-Back Exhaust System

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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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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.

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