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Stillen

Cat-Back Exhaust System with Burnt Tips

$1,720.73 $1,632.13 Save $88.60

SKU: 504452

In Stock
In Stock
Ships by Sep 13
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Stillen 504452 is a cat-back exhaust system designed for 2016-2024 Infiniti Q50 3.0T vehicles. Constructed from 304 stainless steel, this system features mandrel-bent piping to streamline exhaust flow and includes burnt-finish exhaust tips for an aggressive aesthetic.
Show original supplier description
The Stillen 504452 cat-back exhaust system is engineered to replace restrictive factory components on the 2016-2024 Infiniti Q50 3.0T. By optimizing exhaust gas velocity and reducing backpressure, this system enhances both performance and sound. The configuration utilizes a 2.5-inch Y-pipe that connects to a 3-inch mid-pipe, which then branches into a dual rear exit setup featuring 4.5-inch bolt-on tips. Built for durability and fitment, the system uses 304 stainless steel construction and mandrel-bent tubing to ensure smooth flow. The mufflers are tuned to provide a mild, well-mannered note during cruising that transitions into an authoritative, aggressive tone under hard acceleration. The bolt-on design allows for adjustable tip positioning to accommodate various rear valance or diffuser configurations. This system is backed by a limited lifetime warranty from the manufacturer, reflecting its construction quality and rigorous in-house testing at Stillen headquarters.

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 Number504452
CategoryExhaust
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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.

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