{"product_id":"bmw-b58-gen-2-g-series-m340i-m440i-m240i-catless-downpipe","title":"BMW B58 Gen 2 G-Series M340i\/M440i\/M240i Catless Downpipe","description":"\u003ch2\u003eBMW B58 Gen 2 G-Series M340i\/M440i\/M240i Catless Downpipe\u003c\/h2\u003e\n\u003cp\u003eUnlock the full performance potential of your BMW B58TU-powered G-Series platform with this high-flow Catless Downpipe — engineered to maximise exhaust flow, improve turbocharger efficiency, and unleash the true sound of BMW's legendary turbocharged inline-six.\u003c\/p\u003e\n\u003cp\u003eDesigned specifically for the B58 Gen 2 (B58TU) engine, this catless downpipe replaces the restrictive factory catalytic converter, significantly reducing exhaust backpressure and allowing the turbocharger to spool faster and operate more efficiently. The result is sharper throttle response, increased power potential, enhanced turbo acoustics, and a noticeably more aggressive exhaust note.\u003c\/p\u003e\n\u003cp\u003eManufactured from premium mandrel-bent 304 stainless steel and precision TIG welded throughout, this downpipe is built to withstand extreme temperatures and demanding performance applications while maintaining OEM-style fitment and reliability.\u003c\/p\u003e\n\u003cp\u003eWhether paired with the factory exhaust system or a complete aftermarket setup, this catless downpipe provides one of the most effective performance upgrades available for the B58TU platform.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003ch3\u003eHigh-Flow Catless Design\u003c\/h3\u003e\n\u003cp\u003eRemoves the restrictive factory catalytic converter for maximum exhaust flow and performance potential.\u003c\/p\u003e\n\u003ch3\u003ePremium 304 Stainless Steel Construction\u003c\/h3\u003e\n\u003cp\u003eManufactured from corrosion-resistant stainless steel for exceptional durability and heat resistance.\u003c\/p\u003e\n\u003ch3\u003eImproved Turbo Efficiency\u003c\/h3\u003e\n\u003cp\u003eReduced exhaust backpressure allows the turbocharger to spool faster and operate more efficiently.\u003c\/p\u003e\n\u003ch3\u003eMandrel-Bent Tubing\u003c\/h3\u003e\n\u003cp\u003eMaintains unrestricted exhaust flow and consistent pipe diameter throughout the system.\u003c\/p\u003e\n\u003ch3\u003ePrecision TIG Welded\u003c\/h3\u003e\n\u003cp\u003eStrong, clean welds engineered to withstand extreme temperatures and demanding performance applications.\u003c\/p\u003e\n\u003ch3\u003eDirect Bolt-On Fitment\u003c\/h3\u003e\n\u003cp\u003eDesigned specifically for BMW B58 Gen 2 (B58TU) G-Series vehicles using factory mounting locations.\u003c\/p\u003e\n\u003ch2\u003ePerformance Benefits (When Tuned)\u003c\/h2\u003e\n\u003cp\u003e• Increased horsepower and torque potential\u003cbr\u003e• Faster turbo spool and improved throttle response\u003cbr\u003e• Reduced exhaust backpressure\u003cbr\u003e• Enhanced turbocharger efficiency\u003cbr\u003e• Increased turbo whistle and induction acoustics\u003cbr\u003e• More aggressive exhaust note\u003cbr\u003e• Ideal foundation for Stage 2 and higher-performance builds\u003c\/p\u003e\n\u003cp\u003ePerformance gains may vary depending on ECU calibration, fuel quality, and supporting modifications.\u003c\/p\u003e\n\u003ch2\u003eSound Characteristics\u003c\/h2\u003e\n\u003cp\u003eCompared to the factory downpipe, this catless downpipe typically delivers:\u003c\/p\u003e\n\u003cp\u003e• Deeper and more aggressive exhaust tone\u003cbr\u003e• Increased turbo spool and whistle acoustics\u003cbr\u003e• Louder cold starts\u003cbr\u003e• Enhanced pops and burbles (when tuned)\u003cbr\u003e• Greater overall exhaust volume\u003cbr\u003e• Improved exhaust character throughout the rev range\u003c\/p\u003e\n\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\n\u003cp\u003eBMW G20\/G21 M340i xDrive (2019+)\u003cbr\u003eBMW G22\/G23\/G26 M440i xDrive (2021+)\u003cbr\u003eBMW G42 M240i xDrive (2022+)\u003cbr\u003eBMW G29 Z4 M40i (2019+)\u003c\/p\u003e\n\u003cp\u003e3.0L Turbocharged B58 Gen 2 (B58TU) Engine\u003c\/p\u003e\n\u003ch2\u003ePlease Note\u003c\/h2\u003e\n\u003cp\u003eThis is a catless motorsport product intended for off-road and motorsport use only.\u003c\/p\u003e\n\u003cp\u003eProfessional installation is strongly recommended.\u003c\/p\u003e\n\u003cp\u003eECU tuning may be required to fully utilise the performance benefits and prevent potential check engine lights associated with catalyst removal.\u003c\/p\u003e\n\u003cp\u003eVehicles equipped with OPF\/GPF emissions systems may require alternative configurations.\u003c\/p\u003e\n\u003ch2\u003eWhy Choose Proven Performance Parts\u003c\/h2\u003e\n\u003cp\u003eWe specialise in high-performance parts for European vehicles — including Volkswagen GTI \u0026amp; R models, Audi S\/RS platforms, and BMW M vehicles. Every product we offer is carefully selected for its quality, fitment, and real-world performance — tested by enthusiasts, for enthusiasts.\u003c\/p\u003e","brand":"Proven Performance Parts","offers":[{"title":"BMW G20\/G21 M340i xDrive (2019+)","offer_id":52373362802970,"sku":null,"price":585.0,"currency_code":"AUD","in_stock":true},{"title":"BMW G22\/G23\/G26 M440i xDrive (2021+)","offer_id":52373362835738,"sku":null,"price":585.0,"currency_code":"AUD","in_stock":true},{"title":"BMW G42 M240i xDrive (2022+)","offer_id":52373362868506,"sku":null,"price":585.0,"currency_code":"AUD","in_stock":true},{"title":"BMW G29 Z4 M40i (2019+)","offer_id":52373362901274,"sku":null,"price":585.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0951\/1177\/4490\/files\/ShopifyPOST2_5.png?v=1781852340","url":"https:\/\/provenperformanceparts.com.au\/products\/bmw-b58-gen-2-g-series-m340i-m440i-m240i-catless-downpipe","provider":"Proven Performance Parts","version":"1.0","type":"link"}