4SRC 3.5" Large Bore Downpipes

Nissan GT-R R35 (2007–2024)

The 4SRC performance downpipes are engineered to improve exhaust flow efficiency for the VR38DETT engine used in the Nissan GT-R R35 platform.

By utilising a large 3.5-inch primary diameter, these downpipes allow exhaust gases to exit the turbochargers with significantly less restriction compared with smaller factory-style piping. Reducing exhaust back pressure enables the turbochargers to operate more efficiently and supports improved engine performance potential.

The turbine outlet sections are manufactured using cast stainless steel, providing a strong and consistent transition where exhaust gases leave the turbocharger housing. This construction improves durability under extreme temperatures while maintaining a smooth internal flow path.

The remaining pipe sections are fabricated from high-quality stainless steel and precision welded to ensure strength, reliability, and long-term resistance to thermal stress.

To further improve thermal management within the engine bay, the 4SRC downpipes incorporate additional insulation in the centre section, helping reduce radiant heat and protect surrounding components.

The result is a robust performance upgrade designed for enthusiasts seeking improved exhaust flow and durability from the VR38 platform.

Why a 3.5" Downpipe?

Many aftermarket downpipes retain a smaller diameter which can still create restriction when airflow demand increases.

The 3.5-inch large bore design used in the 4SRC downpipes allows exhaust gases to exit the turbine more freely, particularly beneficial on higher power applications where exhaust flow volume is significantly increased.

By increasing the available flow area, the system helps reduce back pressure and supports the efficiency of the turbochargers across a wider performance range.

Why Choose 4SRC Downpipes

Large 3.5" performance-focused design
Cast stainless turbine outlet sections
High-quality stainless steel construction
Additional mid-section thermal insulation
Direct fitment for the Nissan GT-R R35 platform
Compatible with factory and most aftermarket exhaust systems

Our focus is on producing components that combine performance capability, durability, and accurate fitment for real-world use.

Fitment

Nissan GT-R R35
Model Years: 2007 – 2024
Engine: VR38DETT

Designed for the GT-R Platform

At 4SRC we develop components with a focus on proper engineering, material quality, and long-term reliability for the Nissan GT-R community.