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
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Direct fit for Infiniti M56 (2011–2013) & Q70 5.6 (2014–2019)
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Full 2.5" dual stainless system
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High-flow X-pipe for improved scavenging
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Premium Axle-Back Mufflers – clean, aggressive tone without drone
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Mandrel-bent stainless steel construction
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TIG-welded for durability & longevity
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Bolts directly to OEM or PPE headers
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Significant improvements in sound quality & performance
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Designed for the VK56VD 5.6L V8 platform
Vehicle Fitment
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Infiniti M56 / M56x – 2011–2013
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Infiniti Q70 5.6 / Q70 5.6 AWD – 2014–2019
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Compatible with:
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OEM cats/headers
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PPE long-tube headers
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Why Buy from PMD?
PMD brings 25+ years of aftermarket experience to every order. You get:
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Verified authentic PPE Engineering products
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Clear communication and expert fitment guidance
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Faster support from a real enthusiast
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A trustworthy partner for your Infiniti/VK56 build
Premier Motoring Development — Redefine Your Limits.