FR-S BRZ 86 BOSO Axleback: Burnt Style Sound and Fit

By REMARK Exhaust | Published: 2026-10-29

Category: How-to Guides

Learn how to install the BOSO Edition axleback on your FR-S, BRZ, or 86, and what to expect from its burnt stainless sound and fit.

Quick Answer

The BOSO Edition axleback from REMARK Exhaust is a direct bolt-on for 2013–2021 FR-S, BRZ, and 86 models, offering a deeper tone and a burnt stainless finish. Install it yourself in about an hour with basic hand tools.

What Makes the BOSO Edition Different

The BOSO Edition axleback uses a burnt stainless tip that gives your car a distinctive look without needing a full cat-back system. It's a used part, so expect some scratches and blemishes that add to the character.

Because it's an axleback, you're only replacing the rear section. This keeps the install simple and the cost lower than a full system, while still changing the exhaust note noticeably.

Sound and Fit Expectations

The BOSO Edition is designed to produce a deeper, more aggressive tone compared to stock, especially at higher RPMs. It bolts directly to the existing mid-pipe, so fitment is straightforward on all 2013–2021 FR-S, BRZ, and 86 models.

Since it's a used part, the gaskets and hardware are included, but you may want to replace the gaskets if they show wear. The burnt finish is durable, but avoid harsh cleaners that could strip the color.

Installation Steps

Gather Tools and Safety Gear: You'll need a jack, jack stands, 12mm and 14mm sockets, a ratchet, penetrating oil, and safety glasses. Make sure the car is on level ground and securely supported. Never rely on the jack alone; always use jack stands.
Loosen the Stock Axleback Bolts: Spray the bolts connecting the axleback to the mid-pipe with penetrating oil and let it sit for a few minutes. Then loosen them with the 14mm socket. If they're seized, apply more oil and use a breaker bar. Patience here prevents stripping bolts.
Remove the Stock Axleback: Support the stock axleback with a jack or have a helper hold it, then remove the bolts and pull the axleback off the hangers. It may take some wiggling to free it from the rubber mounts. Check the hangers for cracks while you have them off.
Install the BOSO Edition Axleback: Slide the new axleback onto the mid-pipe, align the hangers, and loosely install the bolts. Make sure the tip is centered in the bumper cutout before tightening. Tighten bolts gradually and evenly to avoid a crooked fit.
Torque to Spec and Test: Torque the bolts to the factory specification (typically 30–35 ft-lbs) and double-check all connections. Start the engine and listen for leaks or rattles, then take a short drive. If you hear a leak, re-tighten the bolts and check the gasket alignment.

Product Facts

Axleback (BOSO Edition) Burnt Stainless - Scion FR-S/ Subaru BRZ / Toyota 86 [2013-2021]: This BOSO Edition axleback fits 2013–2021 Scion FR-S, Subaru BRZ, and Toyota 86 models, and includes gaskets and hardware. You get everything needed for a direct bolt-on install, so you don't have to source extra parts.
Axleback (BOSO Edition) Burnt Stainless - Scion FR-S/ Subaru BRZ / Toyota 86 [2013-2021]