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Sales & Specials

Turner Motorsport N54 Downpipes - With High Flow Catalytic Converter

Better flow for turbo response and more power!
Not for sale or use in the state of California.
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Turner Motorsport
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Product Details

Not for sale or use in the state of California.

When it comes to upgrades on a car with turbos nothing will improve power gains like a nice set of down pipes. The best way to free up the power is running a cat-less setup, but with today's emissions regulations this tends to get complicated.

There is still much to be gained with a tune on your car and a high flow intake, however the cats always seem to be the most restrictive point often times throwing these cars into limp mode on a stage 2 tune. The Turner high flow catted down pipes allow you to break that barrier giving your car what it needs to stay out of limp mode when running a more aggressive tune but still maintain the catalytic converters for emissions. You may not see matching gains when compared to cat-less down pipes, but this is the perfect compromise to improve your cars tuning and still be compliant.

 Manufactured using 304 stainless steel to eliminate corrosion, keeping the down pipes looking great and lasting the way they should. The tubing diameter starts out at 3" after the turbo running into a 4.5" x 4" high flow cat down to a 2.5" connection to the exhaust system.



  • 304 Stainless Steel
  • High flow metallic catalytic converter 
  • 3" pipe diameter
  • Street legal


  • Aftermarket ECU software is recommended to maximize performance gains.
  • This product will cause a MIL (Malfunction Indicator Lamp) on factory stock tune.
  • This product is in intended for off-road use only. Not intended for states our counties where regulations prohibit its use.

This Part Fits the Following Vehicles

Make Model Submodel Engine
BMW E82 1 M Coupe N54 3.0L
BMW E82 135i N54 3.0L
BMW E88 135i N54 3.0L
BMW E90 335i N54 3.0L
BMW E92 335i N54 3.0L
BMW E92 335is N54 3.0L
BMW E93 335i N54 3.0L
BMW E93 335is N54 3.0L
*The above product applications have been written by ECS Tuning. All warranties, product application, fitment, and performance are the responsibility of ECS Tuning. For additional information see the terms of use.

ECS Tuning is not affiliated with any automobile manufacturers.
Manufacturer names and/or part numbers are used only for identification purposes.

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