{"product_id":"pure-drivetrain-bmw-b48-b58-s58-billet-flexplate","title":"BMW B48\/B58\/S58 Billet Flexplate","description":"\u003ch4\u003eBuilt to Survive the Torque Spikes of Modern BMW Turbo Sixes and Fours\u003c\/h4\u003e\n\u003cp\u003eThe Pure Drivetrain Solutions 21-458-1000 SUPER-FLEX billet flexplate is engineered for BMW B48, B58, and S58 platforms that see track time, tuning, or high torque converter stall demands. Machined from hand selected aerospace grade alloy steel and hard machined to .002 TIR, the 21-458-1000 replaces the factory stamped steel flexplate with a one piece design rated well beyond OE limits. Every 21-458-1000 flexplate goes through a proprietary three stage heat treating process before being spin tested to 20,000 RPM, exceeding SFI safety standard 29.2. Enthusiasts running upgraded torque converters, higher stall speeds, or built engines choose the 21-458-1000 because it resists the flexing and cracking that leads to premature failure in factory plates.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eOne piece design with integral ring gear teeth matched to N57\/B58\/S58 bolt pattern\u003c\/li\u003e\n\u003cli\u003eHand selected aerospace grade alloy steel sourced from USA steel mills\u003c\/li\u003e\n\u003cli\u003eProprietary three stage heat treating process for long term durability\u003c\/li\u003e\n\u003cli\u003eHard machined to exacting .002 TIR tolerances\u003c\/li\u003e\n\u003cli\u003eLightening pockets for reduced rotating mass\u003c\/li\u003e\n\u003cli\u003eTested to 20,000 RPM, exceeding SFI safety standard 29.2\u003c\/li\u003e\n\u003cli\u003eMultiple torque converter bolt patterns supported\u003c\/li\u003e\n\u003cli\u003eMatte black finish with laser etched logo on every 21-458-1000\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eTrim\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2016-2019\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e340i\u003c\/td\u003e\n\u003ctd\u003eB58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2016-2019\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e440i\u003c\/td\u003e\n\u003ctd\u003eB58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2019-2025\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM340i\u003c\/td\u003e\n\u003ctd\u003eB58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2021-2025\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM440i\u003c\/td\u003e\n\u003ctd\u003eB58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2016-2021\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM240i\u003c\/td\u003e\n\u003ctd\u003eB58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2023\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e540i\u003c\/td\u003e\n\u003ctd\u003eB58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2019-2026\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eZ4\u003c\/td\u003e\n\u003ctd\u003eM40i B58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2019-2020\u003c\/td\u003e\n\u003ctd\u003eToyota\u003c\/td\u003e\n\u003ctd\u003eSupra\u003c\/td\u003e\n\u003ctd\u003eB58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2018-2024\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e330i\u003c\/td\u003e\n\u003ctd\u003eB48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2024\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e430i\u003c\/td\u003e\n\u003ctd\u003eB48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2021-2025\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003eS58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2021-2025\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003eS58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2023-2025\u003c\/td\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM2\u003c\/td\u003e\n\u003ctd\u003eS58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003e21-458-1000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eNot Provided\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAerospace grade alloy steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eMatte black, laser etched logo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesign\u003c\/td\u003e\n\u003ctd\u003eOne piece with integral ring gear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTIR Tolerance\u003c\/td\u003e\n\u003ctd\u003e.002 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTested Speed Rating\u003c\/td\u003e\n\u003ctd\u003e20,000 RPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Standard\u003c\/td\u003e\n\u003ctd\u003eExceeds SFI 29.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e(1) Pure Drivetrain Solutions 21-458-1000 SUPER-FLEX billet flexplate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eAbout Pure Drivetrain Solutions\u003c\/h4\u003e\n\u003cp\u003ePure Drivetrain Solutions designs and manufactures billet drivetrain components for enthusiasts who demand reliability under extreme power. Every part, including the 21-458-1000, is built in the USA to exacting tolerances and tested well beyond published industry safety standards before it reaches the customer.\u003c\/p\u003e\n\u003ch4\u003eFAQ\u003c\/h4\u003e\n\u003cstrong\u003eWhat is the 21-458-1000?\u003c\/strong\u003e\n\u003cp\u003eThe 21-458-1000 is a billet steel flexplate built by Pure Drivetrain Solutions for BMW B48, B58, and S58 engine platforms. It replaces the factory flexplate with a stronger one piece design rated for high stall torque converters and tuned applications.\u003c\/p\u003e\n\u003cstrong\u003eWhich BMW engines use the 21-458-1000?\u003c\/strong\u003e\n\u003cp\u003eThe 21-458-1000 fits vehicles equipped with the B48 four cylinder, B58 inline six, and S58 inline six engines found across 3, 4, 5 Series, Z4, M2, M3, and M4 models.\u003c\/p\u003e\n\u003cstrong\u003eDoes the 21-458-1000 fit the Toyota Supra?\u003c\/strong\u003e\n\u003cp\u003eYes, the 21-458-1000 fits the 2019-2020 Toyota Supra equipped with the B58 engine shared with BMW platforms.\u003c\/p\u003e\n\u003cstrong\u003eIs the 21-458-1000 SFI rated?\u003c\/strong\u003e\n\u003cp\u003eThe 21-458-1000 is tested to 20,000 RPM, which exceeds SFI safety standard 29.2 for flexplates.\u003c\/p\u003e\n\u003cstrong\u003eWhat material is the 21-458-1000 made from?\u003c\/strong\u003e\n\u003cp\u003eThe 21-458-1000 is machined from hand selected aerospace grade alloy steel sourced from USA steel mills and finished with a three stage heat treating process.\u003c\/p\u003e\n\u003cstrong\u003eWill the 21-458-1000 work with a stock torque converter?\u003c\/strong\u003e\n\u003cp\u003eYes, the 21-458-1000 retains the factory bolt pattern layout and works with stock or upgraded torque converters.\u003c\/p\u003e\n\u003cstrong\u003eDoes the 21-458-1000 include installation hardware?\u003c\/strong\u003e\n\u003cp\u003eThe 21-458-1000 ships as the flexplate only. Use OE spec or ARP bolts torqued to manufacturer specification during installation.\u003c\/p\u003e\n\u003cstrong\u003eWhy upgrade to the 21-458-1000 instead of running the factory flexplate?\u003c\/strong\u003e\n\u003cp\u003eThe factory stamped flexplate can flex or crack under high stall torque converters and tuned power levels. The 21-458-1000 one piece billet design eliminates this failure point for track and high performance street use.\u003c\/p\u003e\n\u003ch4\u003eInstall Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eSupport the transmission and remove the transmission from the vehicle following factory service procedures.\u003c\/li\u003e\n\u003cli\u003eRemove the factory flexplate bolts and separate the OE flexplate from the crankshaft flange.\u003c\/li\u003e\n\u003cli\u003eClean the crankshaft flange mating surface and inspect for damage.\u003c\/li\u003e\n\u003cli\u003ePosition the 21-458-1000 flexplate against the crankshaft flange, aligning the dowel pins.\u003c\/li\u003e\n\u003cli\u003eInstall new or OE spec bolts and torque to manufacturer specification in the proper sequence.\u003c\/li\u003e\n\u003cli\u003eReinstall the torque converter and transmission following factory service procedures.\u003c\/li\u003e\n\u003cli\u003eVerify proper flexplate to converter clearance before final assembly.\u003c\/li\u003e\n\u003c\/ol\u003e\n","brand":"Pure Drivetrain Solutions","offers":[{"title":"Default Title","offer_id":46079007653967,"sku":"PDS21-458-1000","price":749.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/BMW_B48_B58_S58_Billet_Flexplate.png?v=1784410630","url":"https:\/\/www.blackopsautoworks.com\/products\/pure-drivetrain-bmw-b48-b58-s58-billet-flexplate","provider":"Black Ops Auto Works","version":"1.0","type":"link"}