BMW introduced a new valvetronic, single turbo version of its direct-injection engine for the F-Chassis models beginning in 2012. The Active Autowerke N20 downpipe for the 228i, 328i and 428i 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 N20 is quite restrictive, which results in slower exhaust gases and slower turbo spool.
The Active Autowerke F-Chassis N20 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" ultra high flow GESI catalytic converter that will NOT produce a CEL
The GESi G-Sport High Output Catalytic Converter features full 304 stainless steel construction, including the substrate. GESi HO-Series Gen 2 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 HO-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!
 
KEY FEATURES
NO CEL for catalytic efficiency when using this downpipe
Designed to be as unrestrictive as possible
GESI EPA registered high flow and fully OBD2 compliant
High flow 4" GESI cat with 3.50" piping allows for maximum power output
Quicker turbo spool - improved power over stock
Rated for 350 to 500 hp applications
Withstands up to 1500 F
Can reach operational efficiency within 9 seconds of startup
Easily bolts-on no cutting or welding required
Durable construction from TIG welded 304 stainless steel
Precise fitment
Modular design for later upgrades
Made in Miami, Florida
Ultra high flow 400 cell per square inch catalyst
EPA compliant for use on OBD2 vehicles (1996 and newer) except in California
Full 304 stainless steel construction
304 stainless steel substrate in the catalytic converter is furnace braised to the mantle for outstanding durability
GESi proprietary precious metal loading technology ensures greatly reduced emissions
Covered by 5 Year / 50,000 Mile Warranty (on shell and tube ends) and 25,000 Mile
Warranty on the Catalytic core
Ideal for Forced Induction Applications with no loss of HP
Both passengers and drivers are safe from harmful emissions and noise
APPLICATIONS
 2012+ 228/328/428