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Active Autowerke

Active Autowerke BMW N55 F3X M235I 335I 435I F87 M2 GESI Catted Downpipe

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Year and Make: N55 catted downpipe only

Active Autowerke BMW N55 Downpipe

BMW introduced a new valvetronic, single turbo version of its direct-injection engine for the F-Chassis models 2014 and up. The Active Autowerke N55 downpipe for the M235i, 335i, 435i and M2 helps unleash some of the potential that is restricted by the OEM downpipe.

Turbochargers are powered by spent exhaust gases created during the combustion process. The quicker these gases are evacuated, the better. Unfortunately, the factory down pipe in the N55 is quite restrictive, which results in slower exhaust gases and slower turbo spool.

The Active Autowerke F-Chassis N55 Signature down pipe utilizes 3.5 diameter stainless steel piping in order to provide more power, quicker spool, and extreme durability. This variant includes a 4.5" high flow GESI catalytic converter that will NOT produce a CEL

The GESi G-Sport Ultra High Output Catalytic Converter features full 304 stainless steel construction, including the substrate. GESi UHO-Series Catalytic Converters are EPA registered and compliant in 49 states and fully OBD2 compliant. GESi proprietary precious metal loading technology ensures greatly reduced emissions, eliminating most "Check Engine Lights". These high flow catalytic converters outperform stock converters and provide a reliable solution to the most common catalytic converter problems.

The GESi UHO-Series Catalytic Converters are rated for engines putting out between 500 and 850 horsepower while maintaining a high flow capacity. The reduced back-pressure from this high flow catalytic converter will allow you to maximize your engines horsepower without the harmful emissions. Say goodbye to Check Engine Lights and failed emissions tests!

Please Note: These catalytic converters are not legal for use on vehicles registered in the state of California as a result of California Vehicle Code Section 27156 and 38391.


  • NO CEL for catalytic efficiency when using this downpipe

  • GESI EPA registered high flow and fully OBD2 compliant

  • Rated for 500 to 850 hp applications

  • Can reach operational efficiency within 9 seconds of startup

  • Durable construction from TIG welded 304 stainless steel

  • Modular design for later upgrades

  • Ultra high flow 400 cell per square inch catalyst

  • Full 304 stainless steel construction

  • GESi proprietary precious metal loading technology ensures greatly reduced emissions

Year and Make: N55 catted downpipe only

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