{"product_id":"milltek-secondary-cat-bypass-bmw-g8x-m3-m4-ssxbm1341","title":"Milltek Secondary Cat Bypass | BMW G8X M3 M4 [SSXBM1341]","description":"\u003cp\u003e102mm single mid pipe non-resonated X pipe secondary catalyst bypass for BMW G8X M3 and M4. Bolts directly to OE axle back (SSXBM1342) or Milltek axle back exhaust (SSXBM1341). Track-focused configuration eliminates secondary catalyst restriction while maintaining OEM+ fitment and hanger compatibility.\u003c\/p\u003e \u003cp\u003eHand-finished T304L stainless steel construction with mandrel-bent piping. Non-resonated design optimized for closed-course and track use. Dyno-proven power gains with engineered tone character across the RPM range.\u003c\/p\u003e \u003cul\u003e \u003cli\u003eFits BMW G8X M3 (S58 engine) and M4 (S58 engine)\u003c\/li\u003e \u003cli\u003eDirect bolt-on to OE or Milltek axle back systems\u003c\/li\u003e \u003cli\u003eUses factory hangers and mounting points — no modification required\u003c\/li\u003e \u003cli\u003eT304L stainless steel, hand-finished\u003c\/li\u003e \u003cli\u003eMandrel-bent X pipe configuration\u003c\/li\u003e \u003cli\u003eTrack\/closed-course optimized — non-resonated\u003c\/li\u003e \u003cli\u003eValve-compatible for OE secondary valve functionality\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e In-house manufacturing from raw stainless steel to finished component ensures precision fit and durability. \u003c\/p\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":50282949968010,"sku":"MTK.SSXBM1341","price":1236.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/4599\/4122\/files\/SSXBM1341_1.jpg?v=1790257377","url":"https:\/\/www.sbxperformance.com\/products\/milltek-secondary-cat-bypass-bmw-g8x-m3-m4-ssxbm1341","provider":"SBX Performance","version":"1.0","type":"link"}