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  • B48 Downpipe BMW De-cat/Sport-cat 120i, 125i, 220i, 230i, 330i, 330ix, 330e, 420i, 420ix, 430i, 430ix, 730i, 730Li, 740e, 740Le
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Custom Downpipe Kit for i.a.  BMW 125i F20/F21, BMW 230i F22/F23, BMW 330i/330i xDrive F30/F31/F34, BMW 420i/420i xDrive/430i xDrive F32/F33/F36, BMW 740Li/740e G11/G12 etc.

You can choose between De-Cat Downpipe and a Sport Cat Downpipe (100/200 CPSI).

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 3,5-inch (88,9mm) 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 120i F21 2017-2018 – 184HP
BMW 125i F20 2011-2019 – 218HP
BMW 220i F22/F23 2014-now – 184HP
BMW 230i F22/F23 2014-now – 248HP
BMW 330i F30 2011-2018 – 248HP
BMW 330i F31 2011-2018 – 248HP
BMW 330i xDrive F30 2011-2018 – 248HP
BMW 330i xDrive F31 2011-2018 – 248HP
BMW 330i G20 2018-(…) – 255HP
BMW 330i G21 2018-(…) – 255HP
BMW 420i F32/F33/F36 2013-2020 – 184HP
BMW 420i xDrive F32/F33/F36 2013-2020 – 184HP
BMW 430i F32/F33/F36 2013-2020 – 248HP
BMW 430i xDrive F32/F33/F36 2013-2020 –  255HP
BMW 730i G11 2015-now – 255HP
BMW 730Li G12 2015-now – 255HP
BMW 740e G11 2015-now – 255HP
BMW 740Le G12 2015-now – 255HP


It is compatible with eninges: B48 (248HP version), B48(255HP version).

You might also consider

B48 Hybrid Turbo Upgrade B46 2.0T B48B BMW 330i F31


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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