BULL BOOST PERFORMANCE RB20 RB25 RB26 DET T4 Top Mount Twin Scroll Turbo Manifold for Nissan GTR – Dual 44mm Wastegate

Part Number: 737123297276

The Bull Boost Performance RB-Series T4 Top Mount Twin Scroll Turbo Manifold is engineered for high-horsepower Nissan RB20, RB25, and RB26 turbocharged applications requiring fast spool response, strong midrange power, and maximum exhaust flow efficiency. Designed specifically for serious street, drag, drift, and track builds, this manifold combines advanced twin-scroll technology with durable motorsport-grade construction.

Built around a true twin-scroll divided pulse design, this manifold helps maximize turbocharger efficiency by separating exhaust pulses for improved turbine response and reduced turbulence. The result is faster turbo spool, improved low-end torque, and substantial power gains throughout the RPM range.

The true merge collector is engineered to promote smooth, turbulence-free exhaust flow while maintaining high exhaust gas velocity into the turbine housing. Runner geometry has also been optimized to compensate for the RB engine platform’s tendency to run leaner toward cylinder #6, helping improve exhaust pulse balance and overall engine efficiency.

Constructed for durability and high-boost applications, this manifold features precision CNC-ported head flanges, machined sealing surfaces, and high-strength fabrication designed to withstand extreme heat and racing conditions.

Key Features & Specifications:

• T4 twin-scroll turbo flange configuration
• Dual 44mm external wastegate flanges
• True twin-scroll divided pulse manifold design
• True merge collector for optimized exhaust flow
• Designed for fast spool and strong midrange power
• CNC-ported head flange for improved flow efficiency
• Machined sealing surfaces for leak-free installation
• Heavy-duty high-performance turbo manifold construction
• Designed specifically for RB-series turbocharged engines

Performance Benefits:

• Faster turbo spool response
• Increased low-end and midrange torque
• Improved exhaust pulse efficiency
• Reduced turbulence entering the turbocharger
• Better boost control with dual 44mm wastegate configuration
• Supports high-horsepower turbocharger setups

Vehicle Fitment:

• Nissan Skyline RB20DET (1986–1993)
• Nissan Skyline RB25DET (1993–2002)
• Nissan Skyline GT-R RB26DETT (1989–2002)
• Nissan RB-series engine swap applications

Installation Note:
Professional installation is strongly recommended. Additional fabrication, turbo system components, and custom tuning may be required depending on vehicle and turbocharger setup.

Warranty Notice:
All warranties, claims, and product-related issues must be handled directly through BULL BOOST PERFORMANCE.