{"product_id":"arrow-r3-71639mi","title":"Arrow Stainless Steel Header Yamaha YZF-R3 (2019-2020) 71639MI","description":"\u003cp\u003eEngineered exclusively for circuit competition, the Arrow 71639MI stainless steel header transforms the Yamaha YZF-R3 into a sharper, more responsive track weapon. Developed to unlock genuine performance gains on the YZF-R3, this header rewrites the throttle response curve and frees up power that the stock exhaust system simply chokes off.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRace-derived stainless steel construction delivers outstanding heat resistance and longevity under sustained high-rpm use\u003c\/li\u003e\n\u003cli\u003e45 mm outlet diameter optimised to match Arrow's exhaust flow targets for the YZF-R3 engine\u003c\/li\u003e\n\u003cli\u003eMeasurably improved throttle response and mid-to-top-end power delivery compared to the original header\u003c\/li\u003e\n\u003cli\u003eWeighing 1.92 kg, the header keeps unsprung and rotating mass in check for a crisper handling feel\u003c\/li\u003e\n\u003cli\u003eDesigned exclusively for race use — no noise or emissions restrictions, purely focused on outright performance\u003c\/li\u003e\n\u003cli\u003ePairs exclusively with the Arrow Slip-On Series 71894 for a complete, performance-matched exhaust system\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003ePerformance on Track\u003c\/h2\u003e\u003cp\u003eThe 71639MI header was designed from the outset as a track-only component. The stainless steel pipework sustains heat cycles that would degrade lesser materials, and the carefully engineered bore and bend geometry keep exhaust gas velocity exactly where it needs to be throughout the rev range. The result is a noticeably crisper pick-up from corner exit and stronger pull all the way to the limiter — exactly what R3 Cup competitors and trackday riders demand.\u003c\/p\u003e\u003ch3\u003eImportant: Slip-On Compatibility\u003c\/h3\u003e\u003cp\u003eFitting this header means the original OEM slip-on silencer can no longer be used. The 71639MI is engineered to mate directly with the Arrow Slip-On Series (part number 71894). Using any other silencer will compromise both performance and fitment integrity. For maximum power gains and long-term reliability, an ECU remap or updated mapping is strongly recommended after installation.\u003c\/p\u003e\u003ch2\u003eFitment \u0026amp; Compatibility\u003c\/h2\u003e\u003cp\u003eThis header fits the following motorcycle:\u003c\/p\u003e\u003cul\u003e\u003cli\u003eYamaha YZF-R3 — model years 2019 and 2020\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003eRace use only. Not road-legal. Not compatible with the original OEM silencer. Must be used with Arrow Slip-On Series 71894.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePart number: 71639MI\u003c\/li\u003e\n\u003cli\u003eMaterial: stainless steel\u003c\/li\u003e\n\u003cli\u003eOutlet diameter: 45 mm\u003c\/li\u003e\n\u003cli\u003eWeight: 1.92 kg\u003c\/li\u003e\n\u003cli\u003eUse: race only (no road homologation)\u003c\/li\u003e\n\u003cli\u003eCompatible silencer: Arrow Slip-On Series 71894\u003c\/li\u003e\n\u003cli\u003eFitment: Yamaha YZF-R3 2019-2020\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Arrow","offers":[{"title":"Default Title","offer_id":53168802824458,"sku":"71639MI","price":418.88,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/71639MI2.png?v=1780815843","url":"https:\/\/inter-pace.com\/products\/arrow-r3-71639mi","provider":"Inter-Pace","version":"1.0","type":"link"}