{"product_id":"milltek-secondary-cat-bypass-for-bmw-g8x-m3-m4-ssxbm1341","title":"Milltek Secondary Cat Bypass for BMW G8X M3 M4","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\n\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\n\u003cul\u003e\n\u003cli\u003eFits BMW G8X M3 (S58 engine) and M4 (S58 engine)\u003c\/li\u003e\n\u003cli\u003eDirect bolt-on to OE or Milltek axle back systems\u003c\/li\u003e\n\u003cli\u003eUses factory hangers and mounting points — no modification required\u003c\/li\u003e\n\u003cli\u003eT304L stainless steel, hand-finished\u003c\/li\u003e\n\u003cli\u003eMandrel-bent X pipe configuration\u003c\/li\u003e\n\u003cli\u003eTrack\/closed-course optimized — non-resonated\u003c\/li\u003e\n\u003cli\u003eValve-compatible for OE secondary valve functionality\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e In-house manufacturing from raw stainless steel to finished component ensures precision fit and durability. \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":60150801400094,"sku":"MILSSXBM1341","price":1236.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0759\/7965\/3406\/files\/SSXBM1341_1.jpg?v=1791255609","url":"https:\/\/shop.signatureautohaus.com\/products\/milltek-secondary-cat-bypass-for-bmw-g8x-m3-m4-ssxbm1341","provider":"Signature Autohaus","version":"1.0","type":"link"}