{"product_id":"racing-lab-b58-4-5-inch-heat-shielded-catless-downpipe","title":"Racing Lab B58 4.5-Inch Heat-Shielded Catless Downpipe","description":"\u003cp\u003eDeveloped for compatible B58 applications, this 4.5-inch catless downpipe replaces the restrictive factory primary catalytic converter with a straight-through exhaust path. The larger internal diameter reduces post-turbine backpressure, supporting quicker turbo response, increased performance headroom, and a louder, more aggressive B58 exhaust note.\u003c\/p\u003e\n\u003cp\u003eThe downpipe is manufactured from 304 stainless steel and enclosed by a thermal insulation layer that helps reduce radiant heat transfer to nearby engine-bay components. Factory-style oxygen-sensor ports support installation on compatible vehicles.\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eCommon B58 Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eToyota GR Supra A90\/A91 3.0 B58 - 2019+\u003c\/li\u003e\n\u003cli\u003eBMW M240i \/ M240i xDrive - F22, F23 and G42 B58 models\u003c\/li\u003e\n\u003cli\u003eBMW 340i \/ M340i and xDrive - F30, F31, F34, G20 and G21 B58 models\u003c\/li\u003e\n\u003cli\u003eBMW 440i \/ M440i and xDrive - F32, F33, F36, G22, G23 and G26 B58 models\u003c\/li\u003e\n\u003cli\u003eBMW 540i \/ 540i xDrive - G30 and G31 B58 models\u003c\/li\u003e\n\u003cli\u003eBMW 740i \/ 740i xDrive - G11 and G12 B58 models\u003c\/li\u003e\n\u003cli\u003eBMW X3 M40i \/ X4 M40i - G01 and G02 B58 models\u003c\/li\u003e\n\u003cli\u003eBMW Z4 M40i - G29 B58 models\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e4.5-inch straight-through catless design\u003c\/li\u003e\n\u003cli\u003eIntegrated thermal insulation layer helps reduce radiant heat\u003c\/li\u003e\n\u003cli\u003e304 stainless-steel construction\u003c\/li\u003e\n\u003cli\u003eFactory-style oxygen-sensor ports\u003c\/li\u003e\n\u003cli\u003eReduced exhaust restriction and post-turbine backpressure\u003c\/li\u003e\n\u003cli\u003eMore pronounced turbo and exhaust sound\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFOR CLOSED-COURSE COMPETITION \/ TRACK USE ONLY.\u003c\/li\u003e\n\u003cli\u003eThis product removes the primary catalytic converter and is not intended for public-road use where emissions equipment removal is prohibited.\u003c\/li\u003e\n\u003cli\u003eA catalyst-efficiency warning light is likely without compatible ECU calibration; suitable tuning is recommended.\u003c\/li\u003e\n\u003cli\u003eFitment can vary by B58 generation, production year, emissions specification, and GPF\/OPF configuration.\u003c\/li\u003e\n\u003cli\u003eConfirm the VIN, turbo outlet, mounting bracket, and original downpipe configuration before ordering.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Racing Lab","offers":[{"title":"Default Title","offer_id":48324138074265,"sku":null,"price":100.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0714\/0651\/8425\/files\/12_019f6688-38c5-4fe4-b619-f3c0bbfddf59.png?v=1784281817","url":"https:\/\/racinglabshop.com\/products\/racing-lab-b58-4-5-inch-heat-shielded-catless-downpipe","provider":"Racing Lab","version":"1.0","type":"link"}