{"title":"Engine: B58","description":"BMW B58 parts grouped by engine code so shoppers can start from the powerplant before narrowing by chassis or category.","products":[{"product_id":"bmw-b58-gen-2-new-pure900","title":"BMW B58 (Gen 2) – NEW Pure900","description":"\u003cp\u003e\u003cstrong\u003ePure Turbos NEW Pure900\u003c\/strong\u003e is a direct-fit upgrade turbo for BMW B58 (Gen 2) engines, built with an upgraded billet compressor wheel, larger turbine wheel, and reinforced bearing housing for sustained high-load durability. VSR high-speed balancing and an OEM-style aftermarket housing deliver smooth performance with true plug \u0026amp; play fitment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUpgraded billet compressor wheel\u003c\/li\u003e\n  \u003cli\u003eLarger, better-flowing turbine wheel\u003c\/li\u003e\n  \u003cli\u003eUpgraded bearing housing for durability\u003c\/li\u003e\n  \u003cli\u003eVSR high-speed balanced\u003c\/li\u003e\n  \u003cli\u003eOEM-style aftermarket housing (plug \u0026amp; play)\u003c\/li\u003e\n  \u003cli\u003eSilicone inlet adapter included\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eCustom tuning required\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCapable of 800+ WHP\u003c\/strong\u003e (results vary by fuel\/supporting mods)\u003c\/li\u003e\n  \u003cli\u003eLimited 1-year (unlimited miles) warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e Direct fit for all 2020+ BMW models equipped with the 3.0L B58 (Gen 2) single-turbo inline-6 engine, including G20\/G21\/G22\/G23\/G26\/G29\/G42\/G44\/G05\/G07\/G11\/G12.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eTHESE PARTS ARE LEGAL FOR USE ONLY IN COMPETITION RACING VEHICLES AS DEFINED UNDER CALIFORNIA LAW, AND ARE NOT LEGAL FOR USE IN ANY OTHER MOTOR VEHICLE.\u003c\/em\u003e\u003c\/p\u003e","brand":"Pure Turbos","offers":[{"title":"6-Port (2020+ Z4\/M240i\/M340i\/M440i\/X3\/X4) \/ Yes \/ Small","offer_id":45809010442437,"sku":null,"price":3870.0,"currency_code":"USD","in_stock":true},{"title":"6-Port (2020+ Z4\/M240i\/M340i\/M440i\/X3\/X4) \/ Yes \/ Medium","offer_id":45809010475205,"sku":null,"price":3870.0,"currency_code":"USD","in_stock":true},{"title":"6-Port (2020+ Z4\/M240i\/M340i\/M440i\/X3\/X4) \/ Yes \/ Large","offer_id":45809010507973,"sku":null,"price":3870.0,"currency_code":"USD","in_stock":true},{"title":"6-Port (2020+ Z4\/M240i\/M340i\/M440i\/X3\/X4) \/ Yes \/ 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It eliminates the restrictive catalytic converter for maximum exhaust flow and improved turbo spool, delivering up to 30 HP increase and a more aggressive exhaust note. The downpipe features smooth bends, a flex section for durability, and a direct bolt-on installation that fits BMW M240i, M340i, 440i, 540i, 740i, X3 M40, X4 M40, X5 40i, X7 40i, Z4 M40i and Toyota Supra models","brand":"MAD","offers":[{"title":"Default","offer_id":45809462378693,"sku":"MAD-007","price":169.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0765\/9841\/1461\/files\/MAD-2007_1__54345.1706204001.386.513.jpg?v=1770945261"},{"product_id":"mad-b58-catted-downpipe","title":"MAD B58 4.5\" Catted Downpipe w\/ Bracket","description":"This 4.5-inch catted downpipe for the BMW B58 engine uses premium 304 stainless steel and a high‑flow catalytic converter to improve exhaust flow while maintaining emissions control. It delivers noticeable horsepower and torque gains, retains OEM fitment with smooth bends and a flex section, and installs as a direct bolt-on. Compatible with left‑hand and right‑hand drive vehicles, it fits BMW M240i, 340i, 440i, 540i, 740i, X3\/X4 M40, X5 40i, X7 40i, Z4 M40i and Toyota Supra","brand":"MAD","offers":[{"title":"Default","offer_id":45809462509765,"sku":"MAD-056","price":369.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0765\/9841\/1461\/files\/PhotoRoom_000_20240111_114207__80787.1705008486.386.513.jpg?v=1770945273"},{"product_id":"mad-b58-5inch-catted-downpipe-no-cel","title":"MAD B58 5\" Catted Downpipe w\/ No CEL Guarantee","description":"Crafted from premium 304 stainless steel, this 5-inch downpipe features a 300‑cell high‑flow catalytic converter and smooth piping that maximizes exhaust flow while ensuring there is no check engine light. It provides deeper exhaust tone, improved power and torque, and comes with a two‑year no‑CEL guarantee. It’s a direct bolt-on fitment for BMW M240i, 340i, 540i, 740i, X3\/X4 M40, X5 40i, X7 40i, Z4 M40i and Toyota Supra","brand":"MAD","offers":[{"title":"Default","offer_id":45809462739141,"sku":"MAD-120","price":949.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0765\/9841\/1461\/files\/WhatsApp_Image_2025-07-29_at_10.19.04_14df2edd__82456.1753979896.386.513.jpg?v=1770945283"},{"product_id":"mad-b58-fat-boy-5inch-catless-downpipe","title":"MAD B58 Fat Boy 5\" Catless Downpipe","description":"The Fat Boy downpipe is an oversized 5-inch catless system that delivers unrestricted exhaust flow, reducing backpressure and unleashing noticeable horsepower and torque gains. Made from high‑quality stainless steel with smooth bends and a flex section, it provides a direct bolt-on fit for BMW M240i, 340i, 540i, 740i, X3\/X4 M40, X5 40i, X7 40i, Z4 M40i and Toyota Supra","brand":"MAD","offers":[{"title":"Default","offer_id":45809462771909,"sku":"MAD-052","price":319.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0765\/9841\/1461\/files\/MAD-2052_1__58369.1706204263.386.513.jpg?v=1770945293"},{"product_id":"mad-b58-gen3-4-5inch-catless-downpipe","title":"MAD B58 Gen 3 4.5\" Catless Downpipe (2025+ M340\/M440)","description":"Designed for the 2025+ B58 Gen‑3 engines, this 4.5-inch catless downpipe uses premium 304 stainless steel to eliminate the restrictive factory catalyst. It significantly improves exhaust flow, throttle response and turbo spool while adding an aggressive exhaust note. 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Made from premium 304 stainless steel, it is a direct bolt-on upgrade that delivers increased horsepower and torque and fits 2025+ BMW M340\/M440 and the forthcoming X3 G45 and X4 G46 models","brand":"MAD","offers":[{"title":"Default","offer_id":45809463001285,"sku":"MAD-127","price":279.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0765\/9841\/1461\/files\/WhatsApp_Image_2025-05-16_at_11.07.45_0a98b8c7__58904.1749140231.386.513.jpg?v=1770945313"},{"product_id":"mad-b58-gen3-5inch-200-cell-catted-downpipe","title":"MAD B58 Gen 3 5\" 200-Cell Catted Downpipe (2025+)","description":"For the 2025+ B58 Gen‑3 engines, this 5-inch downpipe includes a 200‑cell high‑flow catalytic converter that refines the exhaust tone while enhancing power. Constructed from 304 stainless steel with smooth 5-inch piping, it offers a deeper, more controlled sound and significant horsepower and torque gains while ensuring emissions compliance. It fits 2025+ BMW M340\/M440, X3 G45 M50 and X4 G46 M50 models","brand":"MAD","offers":[{"title":"Default","offer_id":45809463066821,"sku":"MAD-128","price":369.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0765\/9841\/1461\/files\/WhatsApp_Image_2025-05-16_at_11.10.08_d6cf4dd5__74847.1749140419.386.513.jpg?v=1770945324"},{"product_id":"mhd-super-tuning-license-b58","title":"MHD Super Tuning License – B58","description":"The MHD Super Tuning License bundles the MHD Flasher, Monitor and Map packs to unlock complete DME remapping for B58 engines. 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