Exhaust› Exhaust Pipes, Systems and Components

Legendex

Big Boy Turbo-Back 3" Mandrel-Bent Exhaust System

$995.00

SKU: EG-SETMUX-1

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Legendex Big Boy Turbo-Back is a 3" performance exhaust system designed for the Isuzu MU-X 3.0L 4JJ1-TCX, model years 2013-10/2016.

Constructed from 409-grade stainless steel with mandrel-bent tubing, this exhaust system aims to deliver increased power, a deeper exhaust note, and improved fuel economy. It utilizes original mounting points and bolts directly to the factory turbo for easier installation.
Show original supplier description
The Legendex Big Boy Turbo-Back exhaust system is engineered for the Isuzu MU-X 3.0L 4JJ1-TCX, specifically for models from 2013 to October 2016. This 3-inch mandrel-bent stainless steel exhaust system is designed to bolt directly to the factory turbo and utilize original mounting points, facilitating a straightforward installation process. Constructed from durable 409 stainless steel, the Legendex system promises to enhance your vehicle's performance by providing raw grunt, a deep rumble, and significant power gains. The design includes a high-flow performance muffler and a diesel-specific high-flow catalytic converter, contributing to improved fuel economy and safer, easier towing. Legendex backs this system with an Unrivalled Off-Road Warranty, highlighting its robustness for serious 4WD applications. Legendex offers customizability to tailor the sound and performance to your preferences. Options include 'Pipe Only' for the loudest and most aggressive tone, 'With Muffler' for the quietest option suitable for daily driving comfort, and 'With Cat' for a loud, raw sound with performance flow. This allows users to choose their desired level of rumble and throttle response, building a personalized system.

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

BrandLegendex
Part NumberEG-SETMUX-1
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.

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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