The Scion FR-S, Subaru BRZ, and Toyota GR86 represent the purest driver's car formula left on the market: low curb weight, rear-wheel drive, mechanical limited-slip differential, and razor-sharp steering. But getting a delicious tone out of the boxer flat-four requires a little extra elegance. Our solution? The SHUTO™ Valved Catback Exhaust.

Inspired by the high-speed corridors and enthusiastic car culture of Tokyo’s expressway network, this system has been engineered from the ground up to make the 2013–2020 ZN6/ZC6 and 2022+ ZN8/ZD8 chassis sing.

The Boxer Problem: Why Other Aftermarket Catbacks Fail

Enthusiasts shopping for an aftermarket setup usually run headfirst into an all-or-nothing compromise. Straight-through systems might sound aggressive on wide-open throttle, but they introduce severe exhaust drone right in the cruising sweet spot between 3,000 and 4,000 RPM. On a 45-minute highway commute, that constant low-frequency cabin resonance wears thin fast. Conversely, conservative systems keep things civilized, but leave you wanting more volume and character when you hit backroads or the track.

The SHUTO™ system was developed to eliminate that trade-off entirely. By integrating active acoustic valve technology with a tuned, resonated mid-pipe, it delivers a genuine no drone exhaust GR86 and BRZ owners can live with 365 days a year—without sacrificing volume when they want to hear the engine sing.

How Valvetronic's SHUTO™ Valved System Changes the Game

At the heart of the SHUTO™ catback is an electronic exhaust valve integrated into a single high-flow rear muffler assembly. Rather than forcing you to settle on one fixed sound level, the system provides two distinct mechanical flow paths operated by a wireless key fob remote:

• Valves Closed: Exhaust gasses are channeled directly through the internal baffling of our Valvetronic rear muffler. This creates a refined, subdued tone engineered specifically to quiet cold starts, pass neighborhood sound ordinances, and maintain conversation-level cabin volume at 75 mph. If you need a quiet sport exhaust setup for early morning departures, this is the solution.

• Valves Open: The electronic butterfly valve opens instantly, bypassing the primary muffler chamber to unleash an unrestricted acoustic path. Backpressure drops, high-RPM exhaust velocity increases, and the FA20/FA24 boxer engine delivers a crisp, motorsport-inspired bark with sharp throttle crackles on rev-matched downshifts.
  

Unlike older pneumatic valve systems that require tapping into engine vacuum lines or running brittle rubber hoses through the chassis, the SHUTO™ system uses a modern, stand-alone electronic valve controller. The wiring harness plugs straight into your vehicle's 12V power supply with no wire-tapping or complex setup required.

Engineering & Craftsmanship: Built for the Chassis

The SHUTO™ system was developed around tight tolerances, clean underbody aerodynamics, and long-term durability:

• T304 Stainless Steel: Fabricated entirely from mandrel-bent, corrosion-resistant T304 stainless steel tubing with a clean brushed finish.

• Resonated Mid-Pipe: Specially tuned to target and eliminate the raspy, metallic harshness common to modified boxer four-cylinders while stripping out cabin-droning frequencies.

• Precision TIG Welds: High-strength, clean bead welds that withstand continuous thermal cycling and track abuse.

• Factory Tip Integration: The rear muffler geometry is engineered to reuse the factory OEM exhaust tips, retaining a clean, stealthy OEM+ look in the rear bumper diffuser cutouts.

• 100% Direct Bolt-On: Mounts directly to factory rubber hanger locations and bolts seamlessly up to the OEM front pipe or aftermarket equivalents with no cutting, welding, or modifications required.

Platform Fitment

Whether you're looking for a track-ready valved exhaust BRZ setup or an everyday Scion FR-S valved catback, this system offers direct fitment across both generations:

• 2013–2016 Scion FR-S (ZN6)

• 2013–2020 Subaru BRZ (ZC6)

• 2017–2020 Toyota 86 (ZN6)

• 2022+ Subaru BRZ (ZD8)

• 2022+ Toyota GR86 (ZN8)

The Verdict: The Best Daily Exhaust for the GR86 and BRZ

If your car does double duty as a weekday commuter and a weekend canyon carver, a fixed-volume exhaust is an unnecessary compromise. The SHUTO™ Valved Sport Exhaust proves that you can run an aggressive, high-flow system on track day and still glide through your neighborhood in total comfort the next morning. It is, quite simply, the best daily exhaust GR86, FR-S, and BRZ drivers can install.

Explore the SHUTO™ Valved Catback Exhaust System for GR86 / BRZ / FR-S today.