Extension Kit, R32-R34

【EXTENSION KIT】

A stock extension is designed to merge the main port (turbine exhaust) and bypass port (wastegate actuator) in turbine exhaust housing. This causes the exhaust stream from the main port to interfere with the bypass port stream when the actuator is opened. The primary and secondary exhaust pressure will rise causing the boost pressure to drop, which can cause a loss in power.
The HKS Extension Kit will optimize the turbines performance with minimal power loss.

The HKS Extension Kit utilizes an individual main port (turbine exhaust) and bypass port (wastegate actuator) to reduce the exhaust gas interference and provide a smoother exhaust flow. This will also reduce backpressure and improve the boost response throughout the RPM range. Even with the stock turbine, the exhaust gas merges in the exhaust housing. This exhaust gas interference can be prevented by a divider in the exhaust flange. The pipes connect towards the lower part of the extension housing where the exhaust gas pressure is lower. The main pipe's diameter is enlarged at the turbine outlet so the swirl flow caused by exhaust gas interference can be reduced. This will also prevent the secondary exhaust pressure from rising, and stabilize the boost pressure to increase the engine output. The flange is made with a high structural steel material, and the piping is made with a high heat resistant and durable Stainless (SUS304). These components will also improve the engine compartment appearance.

Note: This product can be used with an HKS GT Sports Turbine KIT or stock turbine.

Extension kit with a good balance between performance and durability brings out the maximum potential power of the GT III turbine.

【Features】

• It does not only improve exhaust efficiency but also product durability.
• The extension kit balances the two opposing sides of tuning it prevents torque decrease at low-rpm caused by expanding the airflow and reduces the secondary exhaust pressure at high-rpm.
• This extension inlet is a single port matched to the stock turbo of RB26, and the outlet diameter is φ70mm.
• Durability is improved by processing heat resistant stainless steel using the lost-wax casting.

【Performance】

Note: This Output and Torque data were measured by HKS. There are some differences depends on the measuring equipment or the vehicle.