{"product_id":"spark-exhaust-force-silencer-group-400-mm-d-54-yamaha-r1","title":"Spark Exhaust Force Silencer Group 400 mm D.54 Yamaha R1 (2015-2025) GYA8829ST","description":"\u003cp\u003eThe long Force. Spark's 400 mm titanium silencer group for the D.54 STEP1 manifold — fifty millimetres more case than the one supplied in the complete kit, and the silencer Spark names when it says the Force clears the 102 dB limit on this motorcycle.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eForce silencer group, titanium, 400 mm, for the Yamaha R1 and R1M.\u003c\/li\u003e\n\u003cli\u003eBuilt for Spark's D.54 STEP1 3\/4 manifold.\u003c\/li\u003e\n\u003cli\u003eWithin the 102 dB limit of the French championship and the Endurance World Championship.\u003c\/li\u003e\n\u003cli\u003eFifty millimetres longer than the 350 mm Force in the GYA8828T kit.\u003c\/li\u003e\n\u003cli\u003eCylindrical case with a straightforward mounting interface.\u003c\/li\u003e\n\u003cli\u003eSold as a group — silencer with its mounting parts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhy Buy the Silencer Separately\u003c\/h2\u003e\u003cp\u003eTwo reasons. The first is the obvious one: you already run the D.54 manifold, bought as GYA8828 or left over from a kit, and want the silencer to go with it. The second is length. The complete GYA8828T kit ships with the 350 mm Force; this group is the 400 mm.\u003c\/p\u003e\u003cp\u003eFifty millimetres of extra case is fifty millimetres of extra absorption. It is the cheapest lever anyone has for taking decibels out of an exhaust, and Spark uses it deliberately across the range — the longer cases exist to bring the sound level down. If your circuit measures close to the line, the longer silencer is the one that gives you margin.\u003c\/p\u003e\u003ch2\u003eWhich Manifold It Belongs To\u003c\/h2\u003e\u003cp\u003eThis group is sized for the 54 mm STEP1 manifold, which Spark describes as the first version of its R1 3\/4 system, optimised for the 2015-2019 model years and the configuration that reaches the lowest decibel readings.\u003c\/p\u003e\u003cp\u003eIt is not the group for the D.60 manifold. If your bike carries the 60 mm system, the equivalent 400 mm Force group is G00SI38T, which comes with a dB killer, or G00SI41T with the Force Evo case.\u003c\/p\u003e\u003ch2\u003eFitment \u0026amp; Compatibility\u003c\/h2\u003e\u003cp\u003eYamaha R1 and R1M, 2015 through 2025, on Spark's D.54 manifold GYA8828. The complete kit with the shorter 350 mm Force is GYA8828T. The dB killer for Force silencers is G9954.\u003c\/p\u003e\u003ch2\u003eRoad Approval\u003c\/h2\u003e\u003cp\u003eNone. The silencer carries no EC certificate, and the manifold it mounts to removes the catalytic converter. Closed circuits only.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePart number: GYA8829ST\u003c\/li\u003e\n\u003cli\u003eType: Silencer group for 3\/4 system\u003c\/li\u003e\n\u003cli\u003eDesign: Force\u003c\/li\u003e\n\u003cli\u003eMaterial: Titanium\u003c\/li\u003e\n\u003cli\u003eLength: 400 mm\u003c\/li\u003e\n\u003cli\u003eManifold diameter: 54 mm (STEP1)\u003c\/li\u003e\n\u003cli\u003eNoise: within the 102 dB French championship and EWC limit\u003c\/li\u003e\n\u003cli\u003edB killer: not included (G9954 optional)\u003c\/li\u003e\n\u003cli\u003eFitment: Yamaha R1 \/ R1M (2015-2025)\u003c\/li\u003e\n\u003cli\u003eRoad approval: None — track use only\u003c\/li\u003e\n\u003cli\u003eManufacturer: Spark Exhaust Technology, Mantova, Italy\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53607173030154,"sku":"GYA8829ST","price":616.0,"currency_code":"BSD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/gya8829st-daempfer_1924155c-edc6-4a96-a548-8fad03419367.png?v=1788262343","url":"https:\/\/inter-pace.com\/en-bs\/products\/spark-exhaust-force-silencer-group-400-mm-d-54-yamaha-r1","provider":"Inter-Pace","version":"1.0","type":"link"}