{"product_id":"akrapovic-optional-header-titanium-bmw-r-1250-gs-r-rs-rt-e-b12e4-1","title":"Akrapovic Optional Header Titanium BMW R 1250 GS \/ R \/ RS \/ RT (2019-2024) – E-B12E4\/1","description":"\u003cp\u003eThis header has a valve in it. That is unusual — most racing headers are a straight pipe and accept the low-rev flat spot that comes with removing a catalytic converter. Akrapovic built an exhaust valve into this one specifically to keep the boxer rideable below three thousand revs.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAn exhaust valve for improved rideability at low revs — rare in a racing header\u003c\/li\u003e\n\u003cli\u003e6.7 Nm more at 2,650 rpm, with peak torque rising from 132.2 to 136.6 Nm\u003c\/li\u003e\n\u003cli\u003e3.5 PS more at 7,350 rpm, peak output rising to 126.6 PS\u003c\/li\u003e\n\u003cli\u003e1.9 kg against the standard 4.3 kg: 2.4 kg and 55.8 per cent less\u003c\/li\u003e\n\u003cli\u003eMade from the finest titanium\u003c\/li\u003e\n\u003cli\u003eFits the whole R 1250 family: GS, R, RS and RT\u003c\/li\u003e\n\u003cli\u003eNo road approval — circuit use only\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy the Valve Matters on a Boxer\u003c\/h2\u003e\n\u003cp\u003eA BMW boxer makes its character between two and four thousand revs, and it is ridden there all day with luggage aboard. Strip the catalytic converter out of a header and the low-rev fuelling usually suffers — the engine gets flat exactly where the rider spends time.\u003c\/p\u003e\n\u003cp\u003eThe valve closes at low revs to keep gas velocity up, and opens as the engine climbs. The measured result is 6.7 Nm at 2,650 rpm, which is not what one normally sees from a track-only part.\u003c\/p\u003e\n\u003ch2\u003eFour Motorcycles, One Engine\u003c\/h2\u003e\n\u003cp\u003eBMW's 1,254 cc ShiftCam boxer runs in the GS adventure bike, the R roadster, the RS sport-tourer and the RT full-dress tourer. The header route is shared across all four, so one part covers the family.\u003c\/p\u003e\n\u003ch2\u003eRemapping Is Recommended\u003c\/h2\u003e\n\u003cp\u003eAkrapovic recommends rather than requires an ECU remap here, primarily to avoid a check engine light and to get the best throttle response. On a Euro 5+ machine with two lambda sensors the warning will otherwise appear.\u003c\/p\u003e\n\u003ch2\u003eWhat You Need Alongside It\u003c\/h2\u003e\n\u003cp\u003eThis header does not work alone. It requires an Akrapovic slip-on, or the first-fit Akrapovic silencer BMW supplies as an accessory. For the R 1250 GS the matching slip-ons are S-B12SO23-HAAT and S-B12SO23-HAATBL; for the R and RS, S-B12SO22-HALAGTBL; for the RT, S-B12SO21-HALAGT.\u003c\/p\u003e\n\u003ch2\u003eNinety Minutes on a Boxer\u003c\/h2\u003e\n\u003cp\u003eA boxer puts its cylinders out to the sides, which makes the exhaust ports the most accessible on any engine layout. Ninety minutes is nonetheless a workshop figure: the header runs under the engine, the sump guard has to come off on a GS, and on an RT the lower fairing is in the way.\u003c\/p\u003e\n\u003cp\u003eThe valve adds a step of its own — it needs its actuator connected, and that is not a job to rush.\u003c\/p\u003e\n\u003ch2\u003eFitment and Compatibility\u003c\/h2\u003e\n\u003cp\u003eE-B12E4\/1 covers the BMW R 1250 GS, R 1250 R, R 1250 RS and R 1250 RT from model year 2019 through 2024. Installation is quoted at 90 minutes.\u003c\/p\u003e\n\u003ch2\u003eRoad Approval\u003c\/h2\u003e\n\u003cp\u003eNone. This product does not meet emission compliance requirements for street or highway use.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePart number: E-B12E4\/1\u003c\/li\u003e\n\u003cli\u003eEAN: 3831113596480\u003c\/li\u003e\n\u003cli\u003eFitment: BMW R 1250 GS, R, RS, RT (2019–2024)\u003c\/li\u003e\n\u003cli\u003ePart type: optional header with exhaust valve\u003c\/li\u003e\n\u003cli\u003eMaterial: titanium\u003c\/li\u003e\n\u003cli\u003eWeight: 1.9 kg (stock 4.3 kg, saving 2.4 kg \/ 55.8 %)\u003c\/li\u003e\n\u003cli\u003ePower: 126.6 PS (stock 123.3 PS, gain 3.5 PS at 7,350 rpm)\u003c\/li\u003e\n\u003cli\u003eTorque: 136.6 Nm (stock 132.2 Nm, gain 6.7 Nm at 2,650 rpm)\u003c\/li\u003e\n\u003cli\u003eRequires: an Akrapovic slip-on or the BMW accessory Akrapovic silencer\u003c\/li\u003e\n\u003cli\u003eECU remapping: recommended\u003c\/li\u003e\n\u003cli\u003eInstallation time: approx. 90 minutes\u003c\/li\u003e\n\u003cli\u003eRoad approval: none — track use only\u003c\/li\u003e\n\u003cli\u003eCountry of manufacture: Slovenia\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Akrapovic","offers":[{"title":"Default Title","offer_id":53627887190282,"sku":"E-B12E4\/1","price":20855.91,"currency_code":"MXN","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/01_a3d9118b-fb6a-4a2b-911f-a194d3b235b6.png?v=1788530783","url":"https:\/\/inter-pace.com\/en-mx\/products\/akrapovic-optional-header-titanium-bmw-r-1250-gs-r-rs-rt-e-b12e4-1","provider":"Inter-Pace","version":"1.0","type":"link"}