{"product_id":"milltek-secondary-catalyst-bypass-bmw-g8x-m3-m4-ssxbm1342","title":"Milltek Secondary Catalyst Bypass | BMW G8X M3 M4 [SSXBM1342]","description":"\u003cp\u003eMilltek Axle Back Secondary Catalyst Bypass system for BMW G8X M3 and M4. Direct fitment 102mm single mid-pipe with X-pipe configuration. Non-resonated design for closed-course and track use. Connects to either OE axle back (SSXBM1342) or Milltek Cat-Back Axle Back (SSXBM1341).\u003c\/p\u003e \u003cp\u003eMandrel-bent T304L stainless steel construction with hand-finished welds. Removes secondary catalyst restrictions post-turbocharger for improved turbo efficiency and mid-range response. Engineered to work seamlessly with both OEM and Milltek exhaust systems. Uses OE mounting points and hangers—no modification required.\u003c\/p\u003e \u003cul\u003e \u003cli\u003eFits BMW G8X M3 (S58 engine) with OE or Milltek axle-back systems\u003c\/li\u003e \u003cli\u003eFits BMW G8X M4 (S58 engine) with OE or Milltek axle-back systems\u003c\/li\u003e \u003cli\u003eNon-resonated: optimized for track and closed-course driving\u003c\/li\u003e \u003cli\u003e102mm bore mandrel-bent X-pipe design\u003c\/li\u003e \u003cli\u003eT304L stainless, TUV tested for durability\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eDesigned and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.\u003c\/p\u003e\u003ch4\u003eFitment\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBMW 3 Series G80 M3 \u0026amp; M3 Competition S58 3.0 Turbo 2021 and Later\u003c\/li\u003e\n\u003cli\u003eBMW 4 Series G82 M4 \u0026amp; M4 Competition S58 3.0 Turbo 2021 and Later\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eKey Facts\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePipe diameter: 101.60mm\u003c\/li\u003e\n\u003cli\u003eFitting time: 1.5 to 2 hours to fit (including removing OE system)\u003c\/li\u003e\n\u003cli\u003eRace product: Yes\u003c\/li\u003e\n\u003cli\u003eE-marked: No\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Milltek Sport","offers":[{"title":"Default Title","offer_id":50282950000778,"sku":"MTK.SSXBM1342","price":1228.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/4599\/4122\/files\/SSXBM1342_1.jpg?v=1790257378","url":"https:\/\/www.sbxperformance.com\/products\/milltek-secondary-catalyst-bypass-bmw-g8x-m3-m4-ssxbm1342","provider":"SBX Performance","version":"1.0","type":"link"}