HKS GT Extension Down Pipe Kit For Nissan Skyline R34 GTR V-Spec 1418-RN011

The stock extension pipe on the R34 GT-R V-Spec merges the main turbine exhaust port with the wastegate bypass, creating interference that raises exhaust pressure and reduces boost response. The HKS GT Extension Down Pipe Kit (1418-RN011) is a precision upgrade engineered specifically for V-Spec models. It separates the main and bypass ports with a dedicated divider in the exhaust flange, allowing smoother, uninterrupted exhaust flow that significantly lowers backpressure and stabilizes boost across the entire RPM range.

By connecting to the lower section of the extension housing where pressure is naturally lower and enlarging the main pipe diameter at the turbine outlet, the kit effectively minimizes swirl and prevents secondary pressure spikes. This results in faster turbo spool, more consistent boost, and noticeable gains in power and throttle sharpness. Constructed with a high-strength steel flange and durable SUS304 stainless steel piping, the kit offers excellent heat resistance and long-term reliability while adding a clean, professional look to the engine bay.

At Terra Firma Automotive, we supply this genuine HKS GT Extension Down Pipe Kit as a premium exhaust upgrade for R34 GT-R V-Spec owners seeking improved turbo efficiency and overall performance. It works effectively with the stock turbine and many aftermarket setups, making it a versatile choice for both street and track builds. For enthusiasts serious about optimizing exhaust flow and unlocking additional power from their RB26DETT, this HKS extension kit is one of the most impactful supporting modifications available for the V-Spec platform.

 

• HKS GT Extension Down Pipe Kit specifically for R34 GT-R V-Spec
• Separates main exhaust and wastegate bypass ports to eliminate interference
• Reduces backpressure for faster turbo spool and stable boost
• Divider in exhaust flange prevents exhaust gas mixing
• Enlarged main pipe diameter at turbine outlet to minimize swirl
• High-strength steel flange with SUS304 stainless steel piping
• Improves boost response and overall engine output
• Enhances turbo efficiency and throttle sharpness
• Durable construction for high-heat and high-boost applications
• Clean, professional appearance in the engine bay
• Works with stock turbine and compatible aftermarket setups
• Cannot be used with HKS GTIII Sports Turbine Kit
• Premium HKS engineering with proven real-world results
• Essential upgrade for high-performance RB26DETT exhaust systems
• Trusted by Skyline enthusiasts for quality and performance gains
• ⚠️ Emissions / California Legal Disclaimer – Off-Road / Competition Use Only: This product is intended for off-road, competition, and track use only. It is not legal for sale or use on public roads or highways in California (or any other CARB-adopting state). For more information Click Here.