GReddy 10118300 EVOlution GT Cat-Back Exhaust – Scion FR-S & Subaru BRZ

GReddy 10118300 Exhaust Specifications

Vehicle Fitment – Scion FR-S and Subaru BRZ

Important: GReddy 10118300 is intended for the original 2013–2016 exhaust configuration.

GReddy notes that changes to the front exhaust connection on 2017 and newer Toyota 86 and Subaru BRZ models require a revised system.

For 2017–2020 Toyota 86 and Subaru BRZ applications, verify the appropriate later GReddy part number before ordering.

What Does the GReddy EVOlution GT Sound Like?

One of the biggest reasons enthusiasts upgrade the factory FR-S or BRZ exhaust is sound.

The naturally aspirated FA20 boxer engine has a distinct exhaust character, but the factory system is relatively restrained.

The GReddy EVOlution GT introduces a deeper, more noticeable exhaust tone through its larger piping, straight-through muffler design, and resonated mid-pipe.

At idle and during normal driving, the system produces a sportier sound than stock. Under acceleration, the exhaust note becomes more pronounced, allowing drivers to hear more of the FA20 engine’s character.

GReddy publishes sound measurements of approximately 94 dB(A) on the left and 93 dB(A) on the right at 4,500 RPM under its test conditions.

Actual sound levels will vary depending on engine modifications, test conditions, and surrounding exhaust components.

Will It Drone on the Highway?

The EVOlution GT includes a large mid-pipe resonator intended to help manage undesirable exhaust frequencies.

However, no aftermarket exhaust can be guaranteed drone-free under every driving condition.

Highway drone depends on engine RPM, transmission gearing, exhaust configuration, cabin acoustics, and additional modifications.

Our Performance Exhaust: Power, Sound, and Fitment guide explains why resonators, muffler design, and pipe diameter matter when choosing an exhaust that sounds good without becoming tiring on longer drives.

Does a 3-Inch Exhaust Increase FA20 Horsepower?

The GReddy 10118300 uses large 76mm piping designed to reduce exhaust restriction and support increased airflow.

That can be beneficial on modified FA20 engines, particularly when combined with other performance upgrades.

However, the actual horsepower improvement depends on the vehicle’s existing configuration.

On a stock naturally aspirated FR-S or BRZ, gains from a cat-back exhaust alone may be modest.

GReddy has not published a confirmed horsepower or torque increase for this specific system.

The main advantages for most owners are improved exhaust sound, appearance, stainless steel construction, and the potential to support future modifications.

For drivers considering a more complete FA20 build, our FR-S and BRZ ECU tuning coverage discusses how tuning, intake modifications, and a freer-flowing exhaust can work together to improve engine response.

A Smart Exhaust Choice for Supercharged and Turbocharged FR-S Builds

The 3-inch piping diameter makes the EVOlution GT an appealing option for enthusiasts planning forced-induction modifications.

Turbocharged and supercharged engines can produce greater exhaust flow than their naturally aspirated counterparts, making exhaust restriction an important consideration.

GReddy designed this exhaust for both naturally aspirated and boosted applications.

If you’re considering forced induction, our HKS FR-S Supercharger Kit performance article provides an example of how intake, exhaust, and tuning modifications can become part of a more comprehensive FA20 performance package.

An exhaust system should be selected around your realistic power goals, not simply the largest available pipe diameter.

GReddy EVOlution GT vs. Factory FR-S/BRZ Exhaust

Installation Considerations

The GReddy 10118300 is a three-piece cat-back exhaust designed for the 2013–2016 Scion FR-S and Subaru BRZ.

Installation involves removing the original rear exhaust assembly and fitting the GReddy mid-pipe, muffler sections, and supplied mounting components.

GReddy specifies replacing the original mid-pipe doughnut gasket and spring-bolt connection with the appropriate supplied composite gasket and M8 hardware.

Before tightening the system completely, verify that the pipes clear the underbody, suspension, and rear differential.

Center both exhaust tips in the rear bumper openings and inspect the exhaust hangers for proper alignment.

After installation, check for leaks and rattles, then inspect the hardware again after several heat cycles.

Our performance exhaust fitment guide also explains why hanger position, gasket selection, and underbody clearance matter when installing an aftermarket cat-back.

Frequently Asked Questions

Does GReddy 10118300 fit a 2013 Scion FR-S?

Yes. The 2013 Scion FR-S is included in the confirmed application range.

Does it fit a 2015 Subaru BRZ?

Yes. The 2015 Subaru BRZ with the original first-generation exhaust configuration is compatible.

Does it fit a 2016 Scion FR-S?

Yes. GReddy officially lists the 2013–2016 Scion FR-S.

Will it fit a 2017 Toyota 86?

No. GReddy specifies a revised exhaust for the 2017-on configuration. The EVOlution GT replacement part number is 10118301.

Is this a full exhaust system or a cat-back?

It is a cat-back exhaust system. It retains the original catalytic converter and front pipe.

How big are the exhaust tips?

The system features two 115mm (4.5-inch) exhaust tips.

Is the GReddy EVOlution GT loud?

GReddy publishes measurements of 94 dB(A) on the left and 93 dB(A) on the right at 4,500 RPM under its testing conditions. It produces a more aggressive exhaust tone than the factory system.

Does it increase fuel economy?

Fuel economy improvements are not guaranteed. Actual consumption depends on driving habits, engine configuration, and operating conditions.

Is it legal in California?

The system retains the factory catalytic converter, but noise and vehicle modification regulations still apply. GReddy’s published sound measurements should not be interpreted as proof of compliance with every state or local noise limit.

Upgrade Your FR-S or BRZ With the GReddy EVOlution GT

The GReddy 10118300 EVOlution GT Cat-Back Exhaust delivers the combination of performance-inspired engineering, stainless steel durability, and distinctive exhaust sound that enthusiasts expect from GReddy.

With 3-inch piping, dual angled mufflers, a resonated mid-pipe, and polished 4.5-inch exhaust tips, it provides a complete rear exhaust upgrade for the 2013–2016 Scion FR-S and Subaru BRZ.

Bring out the sound and character of your FA20 boxer engine with the GReddy EVOlution GT.