HKS - Nissan Skyline R32/R33/R34 GT-R RB26DETT Extension Kit / Down Pipes

HKS - Nissan Skyline R32/R33/R34 GT-R RB26DETT Extension Kit / Down Pipes

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HKS has developed this Extension Kit specifically for use with RB26DETT engines equipped with HKS GTIII Sports Turbine Kits: the GTIII-SS Sports Turbine Kit, GTIII-RS Sports Turbine Kit, and GTIII-2530 Sports Turbine Kit.

The lost-wax casting method and stainless steel construction allow for a highly efficient, extremely durable product where both factors are needed most. The port matched inlets and 70mm outlets provide the perfect balance of low end torque by maintaining exhaust velocity, while allowing for sufficient flow at high RPM .

In-house testing has shown 25 horsepower gains (from 520 to 545 horsepower) between 5000 RPM and 7000 RPM. 

  • 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.





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


VehicleModelEngineModel YearPipe dia.Code No.PriceRemarks
SKYLINE GT-R BNR32, BCNR33, BNR34 RB26DETT 89/08-02/08     14018-AN005   BNR 34 Vspec is Compatible. Compatibility is unconfirmed with stock/replacement turbos.


*This part is only compatible with the HKS GTIII sport turbine kit. It is unconfirmed whether it can be installed on Stock turbo.*