HKS GT Extension Down Pipe Kit For Nissan Skyline R32 R33 GTR All R34 GTR Non V-Spec 1418-RN005

RB26DETT engines in the R32, R33, and R34 Skyline GT-R (Non V-Spec) suffer from exhaust interference in the stock turbine housing, where the main exhaust port and wastegate bypass merge. This causes elevated primary and secondary exhaust pressure, reducing boost response and limiting overall power. The HKS GT Extension Down Pipe Kit (1418-RN005) resolves this by using separate main and bypass ports with a divider in the exhaust flange, allowing smoother exhaust flow and significantly lower backpressure for faster spool, more stable boost, and increased engine output.

Constructed with a high-strength steel flange and durable SUS304 stainless steel piping, this extension kit enhances thermal resistance and longevity under high-boost conditions. By routing exhaust gases from the lower part of the housing where pressure is reduced and enlarging the main pipe diameter at the turbine outlet, it effectively minimizes swirl and stabilizes boost pressure across the RPM range. The result is improved turbo efficiency and a more responsive power delivery that enthusiasts notice immediately.

At Terra Firma Automotive, we supply this genuine HKS GT Extension Down Pipe Kit as a premium exhaust upgrade for R32, R33, and R34 GT-R owners seeking better turbo performance. It is compatible with HKS GT Sports Turbine Kits or stock turbines, making it a versatile choice for both mild and heavily modified builds. For enthusiasts serious about optimizing exhaust flow and unlocking additional power from their RB26DETT, this HKS extension kit is one of the most effective supporting upgrades you can make to your Skyline.

 

• HKS GT Extension Down Pipe Kit for R32 R33 GTR and R34 GTR Non V-Spec
• Separates main exhaust and wastegate bypass ports to eliminate interference
• Reduces backpressure for faster turbo spool and stable boost
• High-strength steel flange with SUS304 stainless steel piping
• Enlarged main pipe diameter at turbine outlet to minimize swirl
• Improves exhaust flow and overall engine output
• Compatible with HKS GT Sports Turbine Kits or stock turbines
• Cannot be used with HKS GTIII Sports Turbine Kit
• Enhances boost response across the entire RPM range
• Premium HKS engineering with proven real-world results
• Direct upgrade for improved turbo efficiency and power delivery
• Clean, professional appearance in the engine bay
• Essential supporting component for high-boost RB26DETT builds
• Trusted by Skyline enthusiasts for performance and reliability
• ⚠️ 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.