{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"033bd1ded7c7","name":"Factory 4.1 RCT Exhaust Silencer 19-23 Kawasaki KX 450 F X - FMF 042369","sku":"06-9891.F4N","brand":"FMF Exhausts","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":564.92,"formatted":"£564.92"},"summary":"The FMF Racing Factory 4.1 RCT Stainless Slip-On exhaust with carbon end cap utilizes Resonance Chamber Technology™ for increased power and reduced weight. Its compact design centralizes mass by moving the muffler closer to the engine, improving performance and handling. Made in the USA from aerospace-grade aluminum and carbon fiber, this slip-on exhaust offers durability and enhanced throttle response. Features include internal and external Resonance Chamber Technology™ for optimal power, a shorter length to reduce damage risk and aid mass centralization, natural aluminum muffler construction with a carbon fiber end cap, massive power gains across the RPM range, and significant weight reduction. It includes the RTS (Rapid Tuning System) for quick adjustments, a screen-type spark arrestor, and a 94dB quiet insert. For closed course use only. Muffler construction is aluminum with a natural finish, midpipe is stainless steel, and the end cap is carbon fiber. Approximate weight is 7.3 lbs (3.31 kg).","attributes":[{"label":"General Product Group","value":"Exhaust Systems & Parts"},{"label":"General Product Type","value":"Silencer"},{"label":"Variant Id","value":"286343"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/06-9891_2EF4N/69c60281a0b86a69.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/06-9891_2EF4N/69c60281a0b86a69.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/06-9891_2EF4N/c3d0d1ff0293232d.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/06-9891_2EF4N/b32a61185e7225ee.jpg"],"description":"The FMF Racing Factory 4.1 RCT Stainless Slip-On exhaust with carbon end cap utilizes Resonance Chamber Technology™ for increased power and reduced weight. Its compact design centralizes mass by moving the muffler closer to the engine, improving performance and handling. Made in the USA from aerospace-grade aluminum and carbon fiber, this slip-on exhaust offers durability and enhanced throttle response. Features include internal and external Resonance Chamber Technology™ for optimal power, a shorter length to reduce damage risk and aid mass centralization, natural aluminum muffler construction with a carbon fiber end cap, massive power gains across the RPM range, and significant weight reduction. It includes the RTS (Rapid Tuning System) for quick adjustments, a screen-type spark arrestor, and a 94dB quiet insert. For closed course use only. Muffler construction is aluminum with a natural finish, midpipe is stainless steel, and the end cap is carbon fiber. Approximate weight is 7.3 lbs (3.31 kg).","descriptionMarkdown":"### FMF Racing Factory 4.1 RCT Exhaust Silencer with Carbon End Cap\n\nThe FMF Racing Factory 4.1 RCT Stainless Slip-On with Carbon End Cap utilizes advanced Resonance Chamber Technology™ to provide superior power gains and reduced weight. Its compact design centralizes mass by placing the muffler nearer to the engine, improving both performance and handling. Precision manufactured in Southern California from aerospace-grade materials, this slip-on exhaust guarantees durability and enhanced throttle response for performance-oriented riders.\n\n#### Key Features\n\n- Features FMF Resonance Chamber Technology™ internally and externally for maximum power output\n\n- Shorter muffler design minimizes damage from impacts and aids in mass centralization\n\n- Constructed from aerospace-grade natural aluminum with a carbon fiber end cap\n\n- Delivers significant horsepower increases across the entire RPM spectrum\n\n- Offers a substantial weight reduction compared to stock exhaust systems\n\n- Includes the RTS (Rapid Tuning System) for quick and easy adjustments\n\n- Comes with a screen-type spark arrestor and a 94dB quiet insert\n\n- Intended for closed course use only\n\n#### Specifications\n\n- Type: Slip-On\n\n- Configuration: Single\n\n- Muffler Construction: Aluminum\n\n- Finish: Natural\n\n- Midpipe Material: Stainless Steel\n\n- End Cap: Carbon Fiber\n\n- Spark Arrestor: Screen insert included\n\n- Quiet Insert: 94dB insert included\n\n- Approximate Weight: 7.3 lbs (3.31 kg)","weightGrams":null,"fitments":[{"make":"KAWASAKI","model":"KX 450F","cc":null,"notes":null,"years":"2019–2023"},{"make":"KAWASAKI","model":"KX 450X","cc":null,"notes":null,"years":"2019–2023"}],"collections":[{"name":"Exhaust Systems & Parts","url":"https://www.2brosparts.com/api/agent/collection/GB/exhaust-systems-parts"},{"name":"Silencer","url":"https://www.2brosparts.com/api/agent/collection/GB/silencer"}],"links":{"page":"https://www.2brosparts.com/products/factory-41-rct-exhaust-silencer-19-23-kawasaki-kx-450-f-x-fmf-042369","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/033bd1ded7c7:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/033bd1ded7c7:1"}},"market":{"country":"GB","countryName":"United Kingdom","locale":"en-gb","currency":"GBP","exchangeRateFromGbp":1,"pricesIncludeUkVat":true,"checkoutTax":null,"delivery":[{"name":"Standard","description":"Orders £15.00–£59.99 · 2–4 business days","carrier":null,"estimatedDays":"2–4 business days","price":{"amount":4.99,"formatted":"£4.99"},"free":false,"minimumOrder":{"amount":0,"formatted":"£0.00","gbp":0},"weightGrams":null},{"name":"Standard","description":"Orders £60.00 and up · 2–4 business days","carrier":null,"estimatedDays":"2–4 business days","price":{"amount":0,"formatted":"£0.00"},"free":true,"minimumOrder":{"amount":60,"formatted":"£60.00","gbp":60},"weightGrams":null}],"storeUrl":"https://www.2brosparts.com"},"navigate":{"start":"https://www.2brosparts.com/api/agent","search":"https://www.2brosparts.com/api/agent/search/GB/{words+joined+with+plus}"},"howToBuy":{"summary":"Build a basket for the shopper and give them one checkout link. Every URL is a plain path (no query string) and a GET. Nothing is stored between calls.","checkoutLinkFormat":"https://www.2brosparts.com/api/agent/checkout/GB/{basketKey}:{quantity},{basketKey}:{quantity}","steps":["1. Find products: follow links in these responses, or fetch https://www.2brosparts.com/api/agent/search/GB/{words+joined+with+plus} (e.g. https://www.2brosparts.com/api/agent/search/GB/brake+pads). Every product has a basketKey.","2. Optional check: https://www.2brosparts.com/api/agent/basket/GB/{basketKey}:{quantity},{basketKey}:{quantity} returns stock, totals per delivery option and the checkout link.","3. Give the shopper the checkout link. Opening it fills their basket with exactly these items (replacing what was there) and opens checkout for United Kingdom. They pay on 2brosparts.com through Stripe."],"noFetchNeeded":"You can write the checkout link yourself from basketKeys and quantities; nothing has to be fetched first. Each product also has links.buyOneNow, a ready link for one unit.","stateless":"Nothing is saved on our side. The items part of the URL is the whole basket: to change it, write the link again with the new list.","itemsFormat":"basketKey:quantity pairs joined by commas, e.g. 04f24aad4d68:2,7c1e9a0b3f2d:1. Quantity defaults to 1. Up to 50 products, 100 each.","country":"GB is the shopper's delivery country. Swap it for theirs (US, DE, FR…) in any URL; currency, tax and delivery follow it.","tips":["Put everything the shopper wants in one link.","Optionally add your name as a last path segment on checkout links (…/checkout/GB/<items>/claude) so the sale is credited to you.","The checkout link is for the shopper's browser. Do not open it yourself.","Signed-in trade account holders see their trade prices at checkout."]}}