Lexus GX470 Exhaust Upgrade Guide

The 4.7L 2UZ-FE in the Lexus GX470 and 4th Gen Toyota 4Runner V8 responds well to a freer-flowing exhaust: more usable torque, a deeper tone, and better underbody clearance. Here is how the pieces fit together, from the head all the way back, so you can build it in the right order.

1. Headers

The foundation. Our 4.7L 2UZ-FE Mid-Length Headers replace the restrictive factory manifolds with TIG-welded 304 stainless for real torque and horsepower gains. Fits VVT-i and non-VVT-i.

2. Y-Pipe

The GX470 Y-Pipe connects the headers to the rest of the system. Choose the resonated version for a balanced tone, or a catalytic converter option. It bolts to stock or aftermarket headers.

3. Catback or Muffler Dump

Finish it with the Modular Catback System (over-axle dump, stock location, or side exit) or a simple Muffler Dump Pipe for a deeper tone and better clearance.

The P0420 Fix

Running headers or a catless setup will usually trip a P0420 or P0430 check engine code. The fix is our 90° O2 Sensor Spacer. The V8 needs one per bank. Off-road use only.

Finish: Coatings

Protect the raw stainless and keep it looking new with a coating: high-gloss ZyClear clear coat to keep the bare metal look, or a colored Cerakote finish.

Building past the exhaust

Most people who do a full exhaust on a GX470 are building the truck for something bigger. Two upgrades pair naturally with this work, and both live in the same area underneath:

• 18 Gallon Auxiliary Fuel Tank adds serious range without giving up KDSS, factory air ride, or your Class 4 receiver hitch. It tucks above the bumper line. Since we build the GX470 catback and muffler dump ourselves, we are the only shop that can check your exact combination. Message us with your setup before you order.
• Billet control arms, panhard bar and KDSS spacers in 7075 aluminum, for when a lift starts pulling your suspension geometry out of spec and the truck begins to dog track.

Browse all long range fuel systems or the full Lexus GX470 catalog.

Running a GX460 instead?

The 2010 and newer GX460 shares the catback and muffler dump but has its own Y-pipe and no headers option. Read the Lexus GX460 exhaust guide for that truck.

Off-Road Use Notice

Catless and SAIS-delete configurations are intended for off-road, competition, and racing use only, not for use on emissions-controlled vehicles operated on public roads. The buyer is responsible for compliance with all applicable laws.

Everything is TIG-welded 304 stainless, built to order by Brockett Built in central Illinois.