Arrow Stainless Steel Header Yamaha YZF-R6 RJ27 (2017-2026) 71670MI
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Engineered exclusively for track use, the Arrow 71670MI stainless steel header is a race-homologated exhaust component developed specifically for the Yamaha YZF-R6 RJ27 across the 2017–2026 model range. Purpose-built to sharpen throttle response and unlock meaningful power gains, it represents the first critical step in a full Arrow exhaust system upgrade for serious circuit riders.
Key Features
- Race-use certification: designed, tested and approved exclusively for closed-circuit competition — not road legal.
- High-grade stainless steel construction delivers outstanding heat resistance and durability across prolonged track sessions.
- Optimised header geometry sharpens throttle response and improves overall engine performance throughout the rev range.
- 45 mm outlet diameter engineered for compatibility with Arrow mid-pipes and slip-on silencers in the YZF-R6 system.
- Precise fitment for the Yamaha YZF-R6 RJ27 eliminates the fitment compromises of universal alternatives.
- ECU remapping recommended to extract the full performance benefit and protect long-term engine reliability.
Built for the Circuit
Arrow's motorsport heritage runs deep, and the 71670MI header reflects that pedigree. The stainless steel construction handles the extreme thermal cycles of sustained track use without warping or cracking, while the carefully developed pipe routing optimises exhaust scavenging for the R6's high-revving inline-four. At 3.82 kg the header contributes to a leaner overall exhaust package compared to the stock system, freeing the engine to breathe and respond with greater immediacy.
Performance & Setup Notes
To realise the full potential of this header, Arrow strongly recommends a purpose-developed ECU remap. Running a modified exhaust system without updated fuelling can leave measurable performance on the table and, over time, affect engine longevity. Whether you are running a dedicated track-day machine or a full race build, pairing the 71670MI with appropriate mapping is the professional approach to the installation.
Fitment & Compatibility
This header fits the following model exclusively:
- Yamaha YZF-R6 RJ27 — model years 2017 to 2026
Race use only. This component carries no road-use type approval and must not be fitted to any vehicle used on public roads.
Specifications
| Brand | Arrow |
|---|---|
| Part Number | 71670MI |
| Component Type | Header |
| Material | Stainless steel |
| Outlet Diameter | 45 mm |
| Weight | 3.82 kg |
| Fitment | Yamaha YZF-R6 RJ27 (2017–2026) |
| Intended Use | Race use only — not road legal |
| Brand | Arrow |
|---|---|
| Part Number | 71670MI |
| Component Type | Header |
| Material | Stainless steel |
| Outlet Diameter | 45 mm |
| Weight | 3.82 kg |
| Fitment | Yamaha YZF-R6 RJ27 (2017–2026) |
| Intended Use | Race use only — not road legal |
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