{"product_id":"bmw-135i-f20-f21-n55-high-flow-sports-cat-downpipe-200-cell","title":"BMW F Series N55 High Flow Sports Cat Downpipe – 200 Cell | M135i M235i 335i 435i 535i X3 X4 X5 X6","description":"\u003ch2\u003eBMW F Series N55 | High Flow Sports Cat Downpipe – 200 Cell\u003c\/h2\u003e\n\n\u003cp\u003eDirect-fit 200-cell high flow sports catalytic converter downpipe for all BMW F-series vehicles equipped with the N55 B30 3.0L turbocharged inline-six. Hand-fabricated by Promod Works in polished T304 stainless steel, with precision TIG welds and an integrated lambda sensor port — built to replace the restrictive OEM unit and free up the full performance potential of the N55.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e200-cell high flow catalytic substrate — dramatically reduced backpressure vs OEM\u003c\/li\u003e\n  \u003cli\u003eT304 polished stainless steel construction throughout\u003c\/li\u003e\n  \u003cli\u003eHand-TIG welded for maximum strength and gas-tight seals\u003c\/li\u003e\n  \u003cli\u003eIntegrated O2 \/ lambda sensor bung (pre-cat position)\u003c\/li\u003e\n  \u003cli\u003eRetains OEM mounting bracket positions — direct bolt-on fitment\u003c\/li\u003e\n  \u003cli\u003eCompatible with OEM and aftermarket cat-back systems\u003c\/li\u003e\n  \u003cli\u003eSignificant gains when combined with a stage 2 ECU remap\u003c\/li\u003e\n  \u003cli\u003ePromod Works branded badge plate\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility – All BMW F Series N55 3.0L Models\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBMW M135i\u003c\/strong\u003e – F20, F21 (2012–2016) N55 B30 320 hp\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBMW M235i \/ 235i\u003c\/strong\u003e – F22, F23 (2014–2016) N55 B30 326 hp\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBMW 335i\u003c\/strong\u003e – F30, F31, F34 (2012–2015) N55 B30 306 hp\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBMW 435i\u003c\/strong\u003e – F32, F33, F36 (2013–2016) N55 B30 306 hp\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBMW 535i\u003c\/strong\u003e – F10, F11 (2010–2016) N55 B30 306 hp\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBMW X3 xDrive35i\u003c\/strong\u003e – F25 (2011–2017) N55 B30 306 hp\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBMW X4 xDrive35i\u003c\/strong\u003e – F26 (2014–2018) N55 B30 306 hp\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBMW X5 xDrive35i\u003c\/strong\u003e – F15 (2013–2018) N55 B30 306 hp\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBMW X6 xDrive35i\u003c\/strong\u003e – F16 (2014–2019) N55 B30 306 hp\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eEngine:\u003c\/strong\u003e N55 B30 3.0L Turbocharged Inline-6 (all variants above)\u003c\/p\u003e\n\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMaterial: T304 polished stainless steel\u003c\/li\u003e\n  \u003cli\u003eCatalyst cell density: 200 cell high flow\u003c\/li\u003e\n  \u003cli\u003eLambda port: Yes (pre-cat O2 sensor bung included)\u003c\/li\u003e\n  \u003cli\u003eFitment: Direct bolt-on, OEM mounting positions\u003c\/li\u003e\n  \u003cli\u003eFinish: Satin\/polished stainless\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e⚠️ For track and off-road use only.\u003c\/strong\u003e This product is not road legal and is not intended for use on public roads. Fitting this product to a vehicle used on public roads may render it non-compliant with emissions regulations. The buyer accepts full responsibility for compliance with applicable laws.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eThis product is made to order. Lead times may apply — please contact us for current availability and delivery estimates. Professional installation recommended.\u003c\/em\u003e\u003c\/p\u003e","brand":"Promod Shop","offers":[{"title":"200 Cell Sports Cat Downpipe","offer_id":58224352723289,"sku":"PMW-F135-SC-200-001","price":449.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0927\/5749\/2057\/files\/hf_20260605_230640_edbc6002-1a8a-42ff-ae5b-bfd983c6d464.png?v=1780701317","url":"https:\/\/promodparts.com\/products\/bmw-135i-f20-f21-n55-high-flow-sports-cat-downpipe-200-cell","provider":"Promod Shop","version":"1.0","type":"link"}