{"product_id":"milltek-non-resonated-secondary-cat-bypass-for-bmw-g8x-m3-m4-ssxbm1268","title":"Milltek Non-Resonated Secondary Cat Bypass for BMW G8X M3 M4","description":"\u003cp\u003eThe Milltek Axle Back Non-Resonated Secondary Cat Bypass is engineered for BMW G8X M3 and M4 models. This system replaces the secondary catalyst and is designed to fit OEM downpipes and Milltek Axle Back systems only. Direct factory fitment requires no modification.\u003c\/p\u003e\n\u003cp\u003eConstructed from T304L stainless steel with mandrel-bent 3.00\" (76.20mm) primary piping, the non-resonated design eliminates resonance points in the mid-range for a pronounced, race-focused tone. Hand-finished welds and CNC-formed flanges ensure OEM+ build quality. Decibel-tested for full-throttle character without excessive drone at cruise.\u003c\/p\u003e\n\u003ch3\u003eFitment \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBMW M3 G80 (S58 engine)\u003c\/li\u003e\n\u003cli\u003eBMW M4 G82 (S58 engine)\u003c\/li\u003e\n\u003cli\u003eFits OEM downpipes only\u003c\/li\u003e\n\u003cli\u003eCompatible with Milltek Axle Back cat-back systems\u003c\/li\u003e\n\u003cli\u003eDirect bolt-on installation with OEM hangers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e This secondary cat bypass delivers the engineering precision and material integrity expected from the brand—not a universal-fit compromise. \u003c\/p\u003e\n\u003cp\u003eDesigned and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.\u003c\/p\u003e\n\u003ch3\u003eVehicle fitment\u003c\/h3\u003e\n\u003cul class=\"fitment-list\"\u003e\n\u003cli\u003e2021-2026 BMW M3 Competition\u003c\/li\u003e\n\u003cli\u003e2021-2026 BMW M4 Competition\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":60150745792798,"sku":"MILSSXBM1268","price":1164.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0759\/7965\/3406\/files\/SSXBM1268_1.jpg?v=1791255314","url":"https:\/\/shop.signatureautohaus.com\/products\/milltek-non-resonated-secondary-cat-bypass-for-bmw-g8x-m3-m4-ssxbm1268","provider":"Signature Autohaus","version":"1.0","type":"link"}