GR86 Front Pipe with High Flow Cat: What It Does and Fit

By REMARK Exhaust | Published: 2026-10-29

Category: Buying Guides

Learn what a GR86 front pipe with a high flow catalytic converter does, how it fits the GT86/GR86/FR-S/BRZ, and whether it's the right upgrade for your exhaust setup.

Quick answer

A front pipe with a high flow catalytic converter is the next logical step after a catback or midpipe+axleback system for the GR86, GT86, FR-S, or BRZ. It reduces exhaust restriction by replacing the restrictive OEM unit with 2.5" mandrel-bent piping and a metal-core high flow cat, improving flow and sound without a full system replacement.

Why upgrade the front pipe?

The front pipe sits between the intermediate pipe and the midpipe in the exhaust system. The OEM unit has a restrictive catalytic converter and bends that limit exhaust flow, especially after you've already upgraded the catback or axleback. Replacing it with a high flow front pipe reduces backpressure, which can free up some power and alter the exhaust note slightly. It's a targeted improvement for enthusiasts who want more from their existing setup without buying a whole new exhaust system.

Trade-offs to consider

While a high flow catalytic converter improves flow, it may not pass emissions testing in all regions. The REMARK Exhaust front pipe uses a 400-cell metal-core high flow cat, which is more free-flowing than a stock ceramic cat but less restrictive than a straight pipe. Check local laws before installing, as some areas require the original cat or have strict aftermarket cat regulations. Also, installation requires some mechanical skill—it's not a bolt-on for everyone, and you may need to lift the car and work with exhaust hangers.

Compatibility across models

This front pipe is designed for the Toyota GT86/GR86, Scion FR-S, and Subaru BRZ from 2012 onwards. It fits both first-generation (2012-2020) and second-generation (2022+) models, but verify your specific year and trim. The 2.5" diameter matches most aftermarket catback and midpipe systems, making it a seamless addition to an existing upgrade path.

Decision rules for buying a GR86 front pipe

You already have a catback or midpipe+axleback: If you've already upgraded the exhaust behind the front pipe, adding a high flow front pipe is the next step to further reduce restriction. Without it, the OEM front pipe remains a bottleneck. Only upgrade the front pipe after other exhaust mods are in place.
You want a moderate sound change without a full system: The front pipe alone won't drastically change the exhaust note, but it can add a deeper tone and slight increase in volume, especially under load. Pair it with a catback for a more noticeable effect. Expect subtle sound changes; combine with other upgrades for bigger impact.
You need to stay street-legal: The high flow cat is less restrictive than stock but still a catalytic converter. However, it may not pass visual inspection or emissions in states like California that require CARB-approved parts. Check local regulations before purchasing. Verify legality in your area before buying.

Product details

Front Pipe with High Flow Catalytic Converter - Toyota GT86/GR86 / Scion FR-S / Subaru BRZ [2012+]: The front pipe kit includes a high flow catalytic converter with a metal core, 400 cell count, and 2.5" mandrel bent piping. The 400-cell metal core flows significantly better than the stock ceramic cat, reducing restriction while still filtering exhaust gases, which helps with sound and potential power gains.
Front Pipe with High Flow Catalytic Converter - Toyota GT86/GR86 / Scion FR-S / Subaru BRZ [2012+]

Is this upgrade right for you?

Best for

Enthusiasts with a catback or midpipe+axleback who want to maximize exhaust flow
Drivers seeking a modest sound improvement without replacing the entire exhaust system

Not for

Drivers who need a CARB-legal or emissions-compliant part in restrictive states
Those looking for a dramatic sound or power change—consider a full turbo-back or catless setup instead