Premium Stainless Cat-Back With X-Pipe + Axle-Back Mufflers

Unlock the true sound and performance of your Infiniti V8 with the PPE Engineering full cat-back exhaust system for the M56 and Q70 5.6L. Designed to complement PPE’s famous long-tube headers, this system delivers a deep, refined tone and real performance gains without unwanted drone.

Featuring a true dual 2.5" exhaust, a high-flow X-pipe, and PPE’s premium axle-back mufflers, this setup improves exhaust velocity, reduces backpressure, and brings the VK56VD to life. Built from mandrel-bent stainless steel and TIG-welded for strength and longevity, this system is the perfect upgrade for owners seeking a bolt-on, luxury-meets-performance sound upgrade.

Whether used alone or paired with PPE long-tube headers, the result is a smoother powerband, sharper throttle response, and a signature V8 tone worthy of your Infiniti flagship.

Key Features

• Direct fit for Infiniti M56 (2011–2013) & Q70 5.6 (2014–2019)

• Full 2.5" dual stainless system

• High-flow X-pipe for improved scavenging

• Premium Axle-Back Mufflers – clean, aggressive tone without drone

• Mandrel-bent stainless steel construction

• TIG-welded for durability & longevity

• Bolts directly to OEM or PPE headers

• Significant improvements in sound quality & performance

• Designed for the VK56VD 5.6L V8 platform

Vehicle Fitment

• Infiniti M56 / M56x – 2011–2013

• Infiniti Q70 5.6 / Q70 5.6 AWD – 2014–2019

• Compatible with:

  • OEM cats/headers

  • PPE long-tube headers

Why Buy from PMD?

PMD brings 25+ years of aftermarket experience to every order. You get:

• Verified authentic PPE Engineering products

• Clear communication and expert fitment guidance

• Faster support from a real enthusiast

• A trustworthy partner for your Infiniti/VK56 build

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