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CTS Turbo

CTS Turbo 4" Catted Downpipe / Sport Cat Front Pipe/Turbo Outlet for BMW N55 EWG (Electric Wastegate) - F20 F21 F22 F23 F30 F31 F32 F33 F36 F87 M2 (M135i M235i 335i 435i) - High-Flow Catalytic Converter T304 Stainless - CTS-EXH-DP-0023-CAT

CTS Turbo 4" Catted Downpipe / Sport Cat Front Pipe/Turbo Outlet for BMW N55 EWG (Electric Wastegate) - F20 F21 F22 F23 F30 F31 F32 F33 F36 F87 M2 (M135i M235i 335i 435i) - High-Flow Catalytic Converter T304 Stainless - CTS-EXH-DP-0023-CAT

£325.65
£379.99 £325.65
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Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

High-flow sport catalyst front pipe for BMW F-series N55 with electronic wastegate

Transform the way your N55-powered BMW drives with this premium sport cat front section from CTS Turbo. Engineered to free up the exhaust path right at the turbo outlet, this 4 inch catted front pipe reduces back pressure for quicker spool, sharper throttle response and a deeper, more purposeful soundtrack without sounding harsh. If you are searching for an N55 sport cat, turbo front pipe, performance catalyst or exhaust upgrade for your F-series six-cylinder petrol, this is the enthusiast favourite.

Crafted from T304 stainless steel, CAD designed, hand TIG welded and back purged, it delivers OEM-like fit with motorsport-grade quality. We have installed this part on customer cars and our own vehicles and the feedback is outstanding on fitment, sound quality and drivability improvements. Expect a noticeable mid-range punch and a more engaging tone that remains civilised on the motorway. In our experience there is no drone when paired with a factory rear system.

Why this sport cat front pipe stands out

  • Large 4 inch high-flow catted design for N55 EWG models for significantly reduced exhaust restriction
  • Direct bolt-on solution that uses factory mounting points for an OEM-style install
  • T304 stainless construction for durability in all climates with beautiful TIG welds and back purging
  • Crisper throttle response and faster turbo spool-up for stronger mid-range acceleration
  • Refined exhaust note under load and subtle at cruise
  • Designed and test-fitted on real vehicles for precise alignment and clearance

Vehicle compatibility

For BMW F-series models equipped with the N55 engine and electronic wastegate. Please confirm your car is the EWG variant.

1 Series

  • F20 07/2013 to 2015 M135i, M135ix
  • F21 07/2013 to 2015 M135i, M135ix
  • F20 LCI 09/2015 to 06/2019 M135i, M135ix
  • F21 LCI 09/2015 to 06/2019 M135i, M135ix

2 Series

  • F22 09/2015 to 06/2017 M235i, M235ix
  • F22 LCI 09/2016 to 12/2019 M235i, M235ix
  • F23 09/2015 to 06/2017 M235i, M235ix
  • F23 LCI 10/2016 to 12/2019 M235i, M235ix
  • F87 M2 with N55 engine

3 Series

  • F30 07/2013 to 2016 335i
  • F30 LCI 10/2014 to 10/2018 335i
  • F31 07/2013 to 2016 335i
  • F31 LCI 10/2014 to 06/2019 335i

4 Series

  • F32 2013 to 02/2017 435i, 435ix
  • F32 LCI 05/2016 to 12/2019 435i, 435ix
  • F33 03/2015 to 02/2017 435i, 435ix
  • F33 LCI 05/2016 to 12/2019 435i, 435ix
  • F36 Gran Coupé 03/2015 to 02/2017 435i, 435ix
  • F36 Gran Coupé LCI 05/2016 to 12/2019 435i, 435ix

Tuning and EML notes

  • Stage 2 calibration is required to prevent an engine management light
  • Bootmod3 mapping is strongly recommended to avoid EML
  • For USA customers this item is for off-road use only

Key specifications

  • Material T304 stainless steel
  • Manufacturing Hand TIG welded and back purged
  • Design 4 inch high-flow catted front pipe for BMW N55 EWG
  • Fitment Direct replacement using factory mounting points

Part number

CTS-EXH-DP-0023-CAT

Warranty

12 month CTS Turbo warranty against manufacturing defects from date of invoice. Warranty excludes abuse, misuse, consequential damage, normal wear and tear, improper installation or damage resulting from racing. Original purchaser only. If a defect is confirmed, CTS Turbo will repair or replace at their discretion. Other manufacturers’ warranties are handled under their terms.

Please note catalytic converters damaged by crackle tune are not covered under warranty.

Professional fitting

Want it installed correctly first time We recommend professional fitting at MJ Modifications in Warwickshire. Request a fitting quote via info@mjmodifications.co.uk.

Search-friendly terms customers use

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