{"product_id":"b58-4-5-inch-heat-shielded-catless-downpipe","title":"B58 4.5-Inch Heat-Shielded Catless Downpipe","description":"\u003cdiv class=\"rl-product-design-v4\" data-rl-batch=\"supra-refined-20260929\" style=\"max-width:980px;margin:auto;padding:12px 2px 28px;font:inherit;font-size:15px;color:#252525;line-height:1.6\" data-rl-editorial=\"supra-complete-20260929\"\u003e\n\u003cdiv style=\"margin-bottom:27px\"\u003e\n\u003cp style=\"font-size:11px;letter-spacing:2px;font-weight:750;color:#b51e2b;margin:0 0 12px\"\u003eRACING LAB · PRODUCT DETAILS\u003c\/p\u003e\n\u003cp style=\"font-size:26px;font-weight:750;line-height:1.32;color:#202124;margin:0 0 13px\"\u003e4.5-inch heat-shielded B58 catless downpipe — track only\u003c\/p\u003e\n\u003cp style=\"font-size:15px;color:#54585d;line-height:1.8;margin:0\"\u003eA 4.5-inch insulated 304 stainless-steel downpipe for compatible B58 closed-course builds. The straight-through catless design includes factory-style oxygen-sensor ports and integrated heat shielding around the main pipe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,165px),1fr));gap:12px;margin-bottom:34px\"\u003e\n\u003cdiv style=\"background:#f5f5f5;border-radius:10px;padding:18px 10px;text-align:center\"\u003e\n\u003cp style=\"color:#b51e2b;font-size:23px;font-weight:750;margin:0 0 7px\"\u003e4.5 in\u003c\/p\u003e\n\u003cp style=\"font-size:12px;color:#686868;margin:0\"\u003eDownpipe\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f5f5f5;border-radius:10px;padding:18px 10px;text-align:center\"\u003e\n\u003cp style=\"color:#b51e2b;font-size:23px;font-weight:750;margin:0 0 7px\"\u003e304\u003c\/p\u003e\n\u003cp style=\"font-size:12px;color:#686868;margin:0\"\u003eStainless steel\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f5f5f5;border-radius:10px;padding:18px 10px;text-align:center\"\u003e\n\u003cp style=\"color:#b51e2b;font-size:23px;font-weight:750;margin:0 0 7px\"\u003eCatless\u003c\/p\u003e\n\u003cp style=\"font-size:12px;color:#686868;margin:0\"\u003eTrack use\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003csection style=\"margin-bottom:34px\"\u003e\u003cp style=\"font-size:20px;font-weight:700;margin:0 0 14px\"\u003eKey features\u003c\/p\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,360px),1fr));gap:19px 26px\"\u003e\n\u003cdiv style=\"border-bottom:1px solid #e8e8e8;padding-bottom:16px\"\u003e\n\u003cp style=\"font-size:15px;font-weight:700;margin:0 0 6px\"\u003e\u003cspan style=\"color:#b51e2b;margin-right:7px\"\u003e✓\u003c\/span\u003eStraight-through design\u003c\/p\u003e\n\u003cp style=\"font-size:14px;color:#626262;line-height:1.7;margin:0\"\u003eReplaces the primary catalytic converter with a freer-flowing exhaust path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-bottom:1px solid #e8e8e8;padding-bottom:16px\"\u003e\n\u003cp style=\"font-size:15px;font-weight:700;margin:0 0 6px\"\u003e\u003cspan style=\"color:#b51e2b;margin-right:7px\"\u003e✓\u003c\/span\u003eIntegrated insulation\u003c\/p\u003e\n\u003cp style=\"font-size:14px;color:#626262;line-height:1.7;margin:0\"\u003eHelps reduce radiant heat exposure around the downpipe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-bottom:1px solid #e8e8e8;padding-bottom:16px\"\u003e\n\u003cp style=\"font-size:15px;font-weight:700;margin:0 0 6px\"\u003e\u003cspan style=\"color:#b51e2b;margin-right:7px\"\u003e✓\u003c\/span\u003eSensor provisions\u003c\/p\u003e\n\u003cp style=\"font-size:14px;color:#626262;line-height:1.7;margin:0\"\u003eFactory-style oxygen-sensor ports on supported applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-bottom:1px solid #e8e8e8;padding-bottom:16px\"\u003e\n\u003cp style=\"font-size:15px;font-weight:700;margin:0 0 6px\"\u003e\u003cspan style=\"color:#b51e2b;margin-right:7px\"\u003e✓\u003c\/span\u003eB58 performance focus\u003c\/p\u003e\n\u003cp style=\"font-size:14px;color:#626262;line-height:1.7;margin:0\"\u003eIntended for correctly matched, tuned track or competition builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection style=\"margin:0 0 30px\"\u003e\u003cp style=\"font-size:20px;font-weight:700;color:#202124;margin:0 0 12px\"\u003eDesign \u0026amp; construction\u003c\/p\u003e\n\u003cp style=\"font-size:14px;line-height:1.8;color:#565b61;margin:0\"\u003eThe catless layout replaces the primary catalytic converter with a large-diameter straight-through exhaust path for closed-course motorsport applications. Integrated thermal shielding helps control radiant heat around the turbo and adjacent components.\u003c\/p\u003e\u003c\/section\u003e\u003csection style=\"margin:0 0 30px\"\u003e\u003cp style=\"font-size:20px;font-weight:700;color:#202124;margin:0 0 12px\"\u003eFitment \u0026amp; installation\u003c\/p\u003e\n\u003cp style=\"font-size:14px;line-height:1.8;color:#565b61;margin:0\"\u003eInstall only on a compatible closed-course B58 vehicle, with the correct turbo-outlet and downstream connections, oxygen-sensor positioning and heat clearance. Motorsport calibration and professional fitting are recommended.\u003c\/p\u003e\u003c\/section\u003e\u003csection style=\"margin:0 0 30px\"\u003e\u003cp style=\"font-size:20px;font-weight:700;color:#202124;margin:0 0 12px\"\u003eWhat's included\u003c\/p\u003e\n\u003cul style=\"padding-left:21px;margin:0\"\u003e\u003cli style=\"font-size:14px;line-height:1.7;color:#565b61;margin:0 0 7px\"\u003e1 × 4.5-inch insulated B58 catless downpipe\u003c\/li\u003e\u003c\/ul\u003e\u003c\/section\u003e\u003csection style=\"margin-bottom:34px\"\u003e\u003cp style=\"font-size:20px;font-weight:700;margin:0 0 14px\"\u003eVehicle fitment\u003c\/p\u003e\n\u003cdiv style=\"border-top:1px solid #e8e8e8\"\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:minmax(100px,30%) minmax(0,1fr);gap:13px;border-bottom:1px solid #ececec;padding:11px 2px\"\u003e\n\u003cspan style=\"font-size:14px;color:#707070\"\u003eToyota\u003c\/span\u003e\u003cspan style=\"font-size:14px;color:#292929;overflow-wrap:anywhere\"\u003eGR Supra A90 \/ A91 3.0 B58 — verify production year\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:minmax(100px,30%) minmax(0,1fr);gap:13px;border-bottom:1px solid #ececec;padding:11px 2px\"\u003e\n\u003cspan style=\"font-size:14px;color:#707070\"\u003eBMW\u003c\/span\u003e\u003cspan style=\"font-size:14px;color:#292929;overflow-wrap:anywhere\"\u003eF22\/F23\/G42 M240i; F30\/F31\/F34\/G20\/G21 340i\/M340i\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:minmax(100px,30%) minmax(0,1fr);gap:13px;border-bottom:1px solid #ececec;padding:11px 2px\"\u003e\n\u003cspan style=\"font-size:14px;color:#707070\"\u003eBMW\u003c\/span\u003e\u003cspan style=\"font-size:14px;color:#292929;overflow-wrap:anywhere\"\u003eF32\/F33\/F36\/G22\/G23\/G26 440i\/M440i; G30\/G31 540i\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:minmax(100px,30%) minmax(0,1fr);gap:13px;border-bottom:1px solid #ececec;padding:11px 2px\"\u003e\n\u003cspan style=\"font-size:14px;color:#707070\"\u003eBMW\u003c\/span\u003e\u003cspan style=\"font-size:14px;color:#292929;overflow-wrap:anywhere\"\u003eG11\/G12 740i; G01\/G02 X3\/X4 M40i; G29 Z4 M40i — supported B58 variants\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection\u003e\u003cp style=\"font-size:20px;font-weight:700;margin:0 0 14px\"\u003eTechnical specifications\u003c\/p\u003e\n\u003cdiv style=\"border-top:1px solid #e8e8e8\"\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:minmax(100px,30%) minmax(0,1fr);gap:13px;border-bottom:1px solid #ececec;padding:11px 2px\"\u003e\n\u003cspan style=\"font-size:14px;color:#707070\"\u003eDiameter\u003c\/span\u003e\u003cspan style=\"font-size:14px;color:#292929;overflow-wrap:anywhere\"\u003e4.5 in\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:minmax(100px,30%) minmax(0,1fr);gap:13px;border-bottom:1px solid #ececec;padding:11px 2px\"\u003e\n\u003cspan style=\"font-size:14px;color:#707070\"\u003eMaterial\u003c\/span\u003e\u003cspan style=\"font-size:14px;color:#292929;overflow-wrap:anywhere\"\u003e304 stainless steel\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:minmax(100px,30%) minmax(0,1fr);gap:13px;border-bottom:1px solid #ececec;padding:11px 2px\"\u003e\n\u003cspan style=\"font-size:14px;color:#707070\"\u003eCatalyst\u003c\/span\u003e\u003cspan style=\"font-size:14px;color:#292929;overflow-wrap:anywhere\"\u003eNone\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:minmax(100px,30%) minmax(0,1fr);gap:13px;border-bottom:1px solid #ececec;padding:11px 2px\"\u003e\n\u003cspan style=\"font-size:14px;color:#707070\"\u003eHeat shielding\u003c\/span\u003e\u003cspan style=\"font-size:14px;color:#292929;overflow-wrap:anywhere\"\u003eIntegrated insulating layer\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:minmax(100px,30%) minmax(0,1fr);gap:13px;border-bottom:1px solid #ececec;padding:11px 2px\"\u003e\n\u003cspan style=\"font-size:14px;color:#707070\"\u003eSensor fitment\u003c\/span\u003e\u003cspan style=\"font-size:14px;color:#292929;overflow-wrap:anywhere\"\u003eFactory-style oxygen-sensor ports\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003cdiv data-rl-track=\"supra-20260929\" style=\"background:#f7f7f7;border-left:3px solid #b51e2b;border-radius:8px;padding:17px 20px;margin:18px 0 25px\"\u003e\n\u003cp style=\"font-size:15px;font-weight:750;color:#b51e2b;margin:0 0 6px\"\u003eCLOSED-COURSE \/ COMPETITION USE ONLY\u003c\/p\u003e\n\u003cp style=\"font-size:14px;line-height:1.8;color:#565b61;margin:0\"\u003eThis kit removes the primary catalytic converter and is not for public-road use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Racing Lab","offers":[{"title":"Default Title","offer_id":48324138074265,"sku":null,"price":719.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0714\/0651\/8425\/files\/bmw-b58-gen2-4-5-inch-catless-downpipe-gold-heat-shield-rear.png?v=1789344454","url":"https:\/\/racinglabshop.com\/products\/b58-4-5-inch-heat-shielded-catless-downpipe","provider":"Racing Lab","version":"1.0","type":"link"}