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Exterior Components› Body Panels and Components

MP Concepts

Rear Diffuser for Quad Exhaust

Name: Rear Diffuser for Quad Exhaust
Brand: MP Concepts
SKU: 398118

$169.99

SKU: 398118

Free Shipping over $200

$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Moderate — 2–4 hours

Overview

It is constructed from durable, injection-molded ABS plastic with a stippled grain texture.

This diffuser is intended for use with aftermarket quad exhaust systems and is compatible with factory backup sensors. Installation requires cutting a section of the stock rear bumper cover and can be completed in approximately two hours.

Show original supplier description

The MP Concepts Quad Exhaust Rear Diffuser offers an aggressive, race-inspired appearance for your 2015-2017 Premium Package Mustang. Crafted from injection-molded ABS plastic, it utilizes original Ford OEM CAD data for a precise fit and features a stippled grain texture to help conceal minor impacts. Designed specifically for use with aftermarket quad exhaust systems, this diffuser complements the lines of your Premium Package Mustang's rear bumper cover. It is compatible with factory-installed backup sensors, ensuring their functionality is not compromised. The installation process is straightforward but does require a permanent modification, specifically cutting a section of the stock rear bumper cover to integrate the new diffuser. The estimated installation time is around two hours. This rear diffuser is exclusively designed for 2015-2017 GT and EcoBoost Mustangs equipped with the factory Premium Chassis Packages, specifically trim levels 200A, 201A, 400A, and 401A. It will not fit base models. The product is intended for use with aftermarket quad exhaust systems, and MP Concepts also offers separately sold exhaust tips that bolt directly to the diffuser for a quad-tip appearance, even over factory single-tip exits.

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	MP Concepts
Part Number	398118
Category	Exterior Components

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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.

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.

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