The factory downpipe on the R34 GTT/GT RB25DET restricts exhaust flow from the turbo, limiting spool speed and overall power potential. The HKS Stainless Performance Downpipe (3306-SN007) is a high-performance upgrade that replaces the restrictive factory unit with smooth mandrel-bent SUS304 stainless steel piping, dramatically improving exhaust gas flow and reducing backpressure for faster turbo spool, sharper throttle response, and enhanced mid-range power.
HKS engineered this downpipe with precision to endure the extreme heat and stress of turbocharged applications while maintaining optimal strength and corrosion resistance. Its enlarged diameter and smooth bends allow exhaust gases to exit freely, maximizing engine efficiency and producing a crisp, aggressive turbo note without excess drone. This component embodies HKS’s motorsport heritage and is ideal for performance builds, track projects, or high-output RB25DET setups.
At Terra Firma Automotive, we supply this genuine HKS Stainless Performance Downpipe as a premium exhaust upgrade for R34 GTT/GT owners seeking better flow and reliability. It transforms your turbo system into a more efficient setup that supports greater power goals while providing a clean, professional appearance. For enthusiasts serious about exhaust optimization and maximizing RB25DET performance, this HKS downpipe is one of the most effective upgrades you can make to your Skyline.
- HKS Stainless Performance Downpipe for R34 GTT/GT RB25DET
- Replaces restrictive factory turbo outlet piping
- Premium SUS304 stainless steel construction for durability
- Smooth mandrel bends and enlarged diameter for improved flow
- Reduces backpressure for faster turbo spool and better response
- Enhances mid-range power and overall engine efficiency
- Produces crisp, aggressive turbo note without excess drone
- Ideal for performance, track, and high-output RB25DET builds
- Premium HKS engineering with proven real-world results
- Direct upgrade for improved exhaust system efficiency
- Clean, professional stainless steel appearance in the engine bay
- Essential support component for turbo and intercooler upgrades
- 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.
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