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  • N55 BMW De-cat Downpipe 135i/135ix F20/F21, BMW 235i/235ix/M2 F22/F23/F87, BMW 335i/335ix F30/F31/F34/F35, BMW 435i/435ix F32.
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Custom Downpipe Kit for i.a. BMW 135i/135ix F20/F21, BMW 235i/235ix/M2 F22/F23/F87, BMW 335i/335ix F30/F31/F34/F35, BMW 435i/435ix F32.

Presented product is a straight flow (de-cat) version with no catalytic converters.

Every part of this racing focused downpipe replacement is produced using CNC technology and is fully made out of Acid-Resistant Steel. It doesn’t include the Catalytic Converter (CAT) and thereby significantly reduces the back pressure which leads to faster spool, an increase of power and more aggressive exhaust sound. The Sport Cat version also offers huge flow improvement over the stock catalyst, which is the cause of very significant flow resistance. The bigger the diameter of the downpipe, the easier and quicker the turbocharger is able to lead off the exhaust gas. The design of the MuchBoost downpipe is optimized for minimization of variances in cross section area in order to get smooth exhaust gas flow and top performance.
Because a downpipe connects a turbocharger and the catback exhaust, its upgrade is often required for the upgraded turbo to unleash its full power. This upgrade ensures your turbo’s potential is not wasted, it is also a great choice cost-wise!


  1. The downpipe parts are CNC produced, ensuring precise, high quality elements.
    2. The 3-inch (76mm) pipe diameter.
    3. Removed Catalytic Converter, there is also an option to put Sport Cat for this downpipe!
    4. It is made fully out of Acid-Resistant Steel to ensure long life despite being exposed to toxic exhaust gases.
    5. There are 2 sockets for lambda sensors on the assembly.
    6. The shape and mounting points fit with the original car parts, no additional work is needed!
    7. Clean, strong and attractive welds, inside and out!
    8. 100% Plug and Play
    9. Limited 2 years warranty
    10. ECU tune is necessary to avoid the Check Engine Light.


  1. Lowers exhaust temperature, so the charger and the exhaust manifold are more protected.
    2. The highest levels of performance and greater reliability under constant high load conditions.
    3. Allows for smooth flow of the exhaust gases, giving your engine extra power, as well as sharper throttle response!
    4. Lighter than OEM.


BMW 135i F20/F21 2011-2019 – 320HP/326HP
BMW 135ix F20/F21 2011-2019 – 320HP/326HP
BMW 235i F22/F23 2013-now – 326HP
BMW 235ix F22/F23 2013-now – 326HP
BMW M2 F87 2013-now – 365HP
BMW 335i F30/F31/F34/F35 2012-2020 – 306HP
BMW 335ix F30/F31/F34/F35 2012-2020 – 306HP
BMW 435i F32 2013-2020 – 306HP
BMW 435ix F32 2013-2020 – 306HP

It is compatible with engines: N55 (306HP version), N55 (320HP/326HP version), N55 (365HP M2 version).

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For downpipes without catalytic converter or with 100/200-cell catalytic converter, if the second post-catalytic lambda sensor exists, the control unit may display an error message. This does not rectrict driving operation, because first lambda sensor is present for the motor control. The second lambda sensor is only used to monitor the catalyst’s effectiveness, and this check can be programmed out through modifying the chip’s software.
Most of the cars up to Euro 3 Emissioncode do not have post-cat sensors, therefore require no adjustments to avoid the alarm.
In case of catalytic converters, the washcoat content is significantly increased and has a very high oxygen storage capacity. This means, that errors can be avoided. While the EOBD Catalysts are tested up to Euro 4, their durability and use up to Euro 6 is given.
In case of Euro 5 and 6 vehicles, a catalyst with ECE selection is needed, to avoid the above points.
MuchBoost sportcats run a 100 or 200-cell high flow cat which passes road legal emissions tests, while de-cat pipes are for RACE USE ONLY and are NOT road legal.


We need usually ~ 14 working days to perform and send this KIT.


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