Arrow Stainless Steel Header Yamaha YZF-R6 RJ15 (2008–2011) 71378MI

Built for the track and nothing else, the Arrow 71378MI stainless steel header transforms the exhaust flow on the Yamaha YZF-R6 RJ15, delivering sharper throttle response and a measurable gain in power exactly where you need it most — mid-corner and on the way out. This is a dedicated race component, engineered to be pushed to the limit lap after lap.

Key Features

• Precision-engineered stainless steel construction offers exceptional heat resistance and durability under sustained racing conditions.
• Optimised header geometry improves exhaust scavenging for stronger throttle response and increased power output across the rev range.
• 54 mm outlet diameter ensures a clean, high-flow connection to your chosen race silencer.
• Weighing 3.32 kg, the header contributes to an improved power-to-weight balance compared to the standard unit.
• Direct bolt-on fitment for the YZF-R6 RJ15 (2008–2011) — no fabrication or modification required.
• ECU remapping is strongly recommended after installation to extract full performance potential and protect engine longevity.

Race-Ready Performance

Arrow developed the 71378MI exclusively for track use, and every design decision reflects that focus. The stainless steel tube work is shaped to maximise exhaust gas velocity, reducing back pressure and allowing the R6's inline-four to breathe more freely. The result is a more immediate throttle response — critical when precise corner exits and consistent lap times are the goal.

Stainless steel was chosen for its ability to withstand the extreme thermal cycles of repeated hard track sessions. Unlike mild steel alternatives, it resists oxidation and maintains structural integrity even after extended use at high operating temperatures, making it a sound long-term investment for club racers and championship competitors alike.

ECU Mapping Note

To realise the full performance benefit and safeguard engine durability, Arrow strongly recommends reprogramming the ECU after fitting this header. A custom map tailored to the revised exhaust characteristics will ensure optimal fuelling across the entire rev range and prevent any lean running conditions that could affect reliability.

Fitment & Compatibility

This header is designed specifically for the following motorcycle:

• Yamaha YZF-R6 RJ15 — model years 2008, 2009, 2010, 2011

Race use only. This product carries no road-use approval and must not be used on public roads.

Specifications