CTS Turbo 4.5" High Flow Downpipe W/Cat - B58 (16+ F3X,G2X,G3X)

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SKU: 112600

Product Details


The CTS Turbo High-Flow Cat pipe for the BMW B58 is made to maximize exhaust flow for the highest power gains. Do not compromise performance and sound with factory parts – unleash your BMW’s potential!

Designed using the latest in CAD technology; this part is made to fit perfectly in place of your factory downpipe. Manufactured from T304 stainless steel, hand TIG welded and back purged to ensure years of reliable performance.



Proper software is strongly recommended to avoid the CEL from coming on.

*Not included* but recommended:

- Downpipe ring gasket (18328612538) Available from your local BMW dealer.


1. T50 Torx

2. Oxygen sensor socket

Product Features

  • Precisely designed and tested on a real car in the real world
  • T304 stainless steel, TIG welded back-purged construction
  • Replaces restrictive factory downpipe
  • Great power upgrade with uncompromising performance
  • Incredible sporty exhaust sound, subtle when cruising
  • No drone with factory exhaust


12 Months
All CTS Turbo products are warrantied against manufacturing defects for a period of 12 months from the date of invoice. Warranty does not cover abuse, misuse, consequential damages, normal wear and tear, improper installation, or damages resulting from racing. Warranties only apply to the original owner. If a product is found defective the customer will receive, at the discretion of CTS Turbo, free repair or replacement. Warranty on other manufacturers will be processed under their terms.

Fitment Guide

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Fitment Guide

Fitment Guide

Start Year End Year Make Model Submodel Cyl Lit Fuel FuelDel ASP EngDesg Notes
2016 2018 BMW 3 Series 340i Sedan
340i xDrive Sedan
L6 3.0 GAS FI T B58  
2017 2019 BMW 3 Series 340i GT xDrive L6 3.0 GAS FI T B58  
2017 2019 BMW 4 Series 440i Coupe
440i xDrive Coupe
L6 3.0 GAS FI T B58  
2017 2019 BMW 4 Series 440i Convertible
440i xDrive Convertible
L6 3.0 GAS FI T B58  
2017 2019 BMW 4 Series 440i Gran Coupe
440i xDrive Gran Coupe
L6 3.0 GAS FI T ALL  
2017 2019 BMW 5 Series 540i Sedan
540i xDrive Sedan
L6 3.0 GAS FI T B58  

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