• HKS Extension Kit w/ Catalytic Converter | Toyota 86 (17+) / Subaru BRZ (12-19) / Scion FR-S (13-16) (11999-AT002)
  • HKS Extension Kit w/ Catalytic Converter | Toyota 86 (17+) / Subaru BRZ (12-19) / Scion FR-S (13-16) (11999-AT002)
  • HKS Extension Kit w/ Catalytic Converter | Toyota 86 (17+) / Subaru BRZ (12-19) / Scion FR-S (13-16) (11999-AT002)
  • HKS Extension Kit w/ Catalytic Converter | Toyota 86 (17+) / Subaru BRZ (12-19) / Scion FR-S (13-16) (11999-AT002)
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HKS Extension Kit w/ Cat | Toyota 86 / Subaru BRZ / Scion FR-S (12-21) (11999-AT002)

HKS Extension Kit w/ Cat | Toyota 86 / Subaru BRZ / Scion FR-S (12-21) (11999-AT002)

11999-AT002

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$928.94 USD
$940.00 USD $928.94 USD
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The HKS Extension Kit with Cat for the Toyota 86, Subaru BRZ, and Scion FR-S is an exhaust component designed to optimize flow and boost response. Featuring an innovative design that utilizes separate main and bypass ports for the turbine exhaust and wastegate actuator, this kit minimizes exhaust gas interference. The use of a divider in the exhaust flange prevents exhaust gas mixing within the housing, resulting in smoother exhaust flow, reduced backpressure, and improved turbocharger responsiveness across the RPM range. Constructed with high-quality materials, the extension kit enhances overall performance and durability, making it suitable for enthusiasts seeking precise exhaust tuning.

This extension kit is compatible with 2012 to 2021 models of the Toyota 86, Subaru BRZ, and Scion FR-S, fitting vehicles equipped with stock turbines. It serves as an upgrade or replacement component for improved exhaust efficiency and boost control. Installation involves connecting the pipes toward the lower part of the extension housing, ensuring proper alignment and sealing. The kit includes the necessary piping and flange components, making it suitable for street and track applications where optimized exhaust flow and turbo response are desired. Proper fitment and installation are essential for achieving the best performance gains.

Overview

HKS Extension Kit w/ Cat

Part #: 11999-AT002

Overview

The HKS Extension Kit w/ Cat is an advanced exhaust component designed for Toyota 86, Subaru BRZ, and Scion FR-S models from 2012 to 2021. This kit features a specialized design that utilizes an individual main port (turbine exhaust) and bypass port (wastegate actuator) to optimize exhaust flow. Its primary purpose is to reduce exhaust gas interference, resulting in a smoother and more efficient exhaust flow. This helps improve overall engine response and boost performance, especially in turbocharged applications. Crafted for enthusiasts seeking to enhance their vehicle’s responsiveness and exhaust efficiency, this extension kit supports a more direct and controlled exhaust path, contributing to better throttle response and reduced backpressure. It is suitable for those looking to maximize their turbo system’s potential while maintaining a reliable and durable setup.

Key Features

This extension kit is engineered with precision to support optimal exhaust flow and boost response. Key features include:
  • Individual main port (turbine exhaust) and bypass port (wastegate actuator) design
  • Minimizes exhaust gas interference for smoother flow
  • Reduces backpressure to support improved boost response
  • Constructed with high-quality materials for durability
  • Designed for compatibility with Toyota 86, Subaru BRZ, and Scion FR-S (2012-2021)
  • Helps enhance turbocharger efficiency and responsiveness
  • Includes a catalytic converter for emissions compliance and performance

Construction & Design

The kit features a precisely machined exhaust flange with a divider to prevent exhaust gas interference within the housing. The pipes are crafted to connect seamlessly to the existing exhaust system, ensuring a secure fit and optimal flow dynamics. The materials used are selected for heat resistance and longevity, supporting consistent performance under demanding conditions.

Installation & Fitment

Installation should be performed by a qualified technician familiar with turbocharged Subaru and Toyota models. Proper fitment requires connecting the extension kit to the existing exhaust system, ensuring all connections are secure and leak-free. Compatibility should be verified against the vehicle’s specifications and the part number provided.

What’s Included

The package includes the main extension pipe, bypass port, catalytic converter, and all necessary hardware for installation.
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