{"product_id":"b58-2025-gen-3-m340-m440-fat-boy-50-downpipe-catless","title":"BMW B58 2025+ Gen 3 M340 M440 Fat Boy 5.0\" Downpipe Catless","description":"\u003cp data-end=\"399\" data-start=\"26\"\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003e SOLD OUT back in Stock ETA July 2026 \u003c\/strong\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"399\" data-start=\"26\"\u003eUpgrade your 2025+ BMW M340 M440 with the MAD BMW B58 Gen 3 \"Fat Boy\" 5.0\" Catless Downpipe—the ultimate performance upgrade designed to unleash the full potential of your engine. Crafted from premium-quality 304 stainless steel, this larger-diameter 5.0-inch downpipe offers superior airflow, delivering enhanced horsepower, quicker turbo response, and noticeable torque gains.\u003c\/p\u003e\n\u003cp data-end=\"732\" data-start=\"401\"\u003eThe increased diameter of the \"Fat Boy\" downpipe sets it apart from our standard catless models by providing a deeper, richer, and significantly more aggressive exhaust tone. Precision-engineered welds and exceptional craftsmanship ensure perfect fitment, durability, and peak performance for enthusiasts demanding maximum results.\u003c\/p\u003e\n\u003cp data-end=\"919\" data-start=\"734\"\u003eTransform your BMW M340's driving experience by choosing MAD's top-tier downpipe, designed specifically for drivers seeking ultimate airflow and a sound profile that commands attention.\u003c\/p\u003e\n\u003cp data-end=\"934\" data-start=\"921\"\u003e\u003cstrong data-end=\"934\" data-start=\"921\"\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"989\" data-start=\"938\"\u003ePremium 304 stainless steel for superior durability\u003c\/li\u003e\n\u003cli data-end=\"1056\" data-start=\"992\"\u003eExpanded 5.0-inch diameter for unmatched airflow and performance\u003c\/li\u003e\n\u003cli data-end=\"1107\" data-start=\"1059\"\u003eDeeper, richer, and more aggressive exhaust tone\u003c\/li\u003e\n\u003cli data-end=\"1179\" data-start=\"1110\"\u003eImproved horsepower and torque compared to standard catless downpipes\u003c\/li\u003e\n\u003cli data-end=\"1233\" data-start=\"1182\"\u003ePrecision craftsmanship and perfect bolt-on fitment\u003c\/li\u003e\n\u003cli data-end=\"1309\" data-start=\"1236\"\u003eIdeal for high-performance builds and enthusiasts seeking maximum results\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-pm-slice=\"1 1 []\" data-prosemirror-node-block=\"true\" data-prosemirror-node-name=\"paragraph\" data-prosemirror-content-type=\"node\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cp data-renderer-start-pos=\"11\"\u003eDoes not fit euro models (check downpipe flange design before ordering)\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-prosemirror-node-block=\"true\" data-prosemirror-node-name=\"paragraph\" data-prosemirror-content-type=\"node\"\u003e2025+ BMW M340\u003c\/li\u003e\n\u003cli data-prosemirror-node-block=\"true\" data-prosemirror-node-name=\"paragraph\" data-prosemirror-content-type=\"node\"\u003e2025+ BMW M440\u003c\/li\u003e\n\u003cli data-pm-slice=\"1 1 []\" data-prosemirror-node-block=\"true\" data-prosemirror-node-name=\"paragraph\" data-prosemirror-content-type=\"node\"\u003e2025+ BMW X3 G45 M50\u003c\/li\u003e\n\u003cli data-prosemirror-node-block=\"true\" data-prosemirror-node-name=\"paragraph\" data-prosemirror-content-type=\"node\"\u003e2025+ BMW X4 G46 M50\u003c\/li\u003e\n\u003cli data-prosemirror-node-block=\"true\" data-prosemirror-node-name=\"paragraph\" data-prosemirror-content-type=\"node\"\u003e2024+ BMW X5\/X6\/X7 40i \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-pm-slice=\"1 1 []\" data-prosemirror-node-block=\"true\" data-prosemirror-node-name=\"paragraph\" data-prosemirror-content-type=\"node\"\u003e\u003cstrong data-prosemirror-mark-name=\"strong\" data-prosemirror-content-type=\"mark\"\u003eEmissions Disclaimer:\u003c\/strong\u003e\u003cbr data-prosemirror-node-inline=\"true\" data-prosemirror-node-name=\"hardBreak\" data-prosemirror-content-type=\"node\"\u003eThis product is \u003cstrong data-prosemirror-mark-name=\"strong\" data-prosemirror-content-type=\"mark\"\u003enot legal for sale or use on pollution-controlled vehicles\u003c\/strong\u003e operated on public roads, highways, or streets. It is \u003cstrong data-prosemirror-mark-name=\"strong\" data-prosemirror-content-type=\"mark\"\u003eintended for off-road, race, or closed-course competition use only\u003c\/strong\u003e, where such modifications are permitted.\u003c\/p\u003e\n\u003cp data-prosemirror-node-block=\"true\" data-prosemirror-node-name=\"paragraph\" data-prosemirror-content-type=\"node\"\u003eBy purchasing this product, you acknowledge and agree that:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-prosemirror-node-block=\"true\" data-prosemirror-node-name=\"paragraph\" data-prosemirror-content-type=\"node\"\u003eYou are responsible for compliance with all applicable emissions laws and regulations.\u003c\/li\u003e\n\u003cli data-prosemirror-node-block=\"true\" data-prosemirror-node-name=\"paragraph\" data-prosemirror-content-type=\"node\"\u003eMAD and its affiliates disclaim any liability for improper or unlawful use of this product.\u003c\/li\u003e\n\u003cli data-prosemirror-node-block=\"true\" data-prosemirror-node-name=\"paragraph\" data-prosemirror-content-type=\"node\"\u003eUse of this part on public roads may violate the Federal Clean Air Act (42 U.S.C. § 7522) and similar state laws.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-prosemirror-node-block=\"true\" data-prosemirror-node-name=\"paragraph\" data-prosemirror-content-type=\"node\"\u003ePlease check your local laws before purchase and installation.\u003c\/p\u003e","brand":"BOOTMOD3 TUNING USA","offers":[{"title":"Default Title","offer_id":45546105602221,"sku":"MAD-127","price":279.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9299\/4989\/files\/image_2025-12-07_133834076.webp?v=1767650774","url":"https:\/\/bootmod3tuning.com\/products\/b58-2025-gen-3-m340-m440-fat-boy-50-downpipe-catless","provider":"BOOTMOD3 TUNING USA","version":"1.0","type":"link"}