BMW F30 N20 Catted Downpipe By Evolution Racewerks

I installed this catted downpipe in the spring of 2025, drove less than 1k miles with it, the change in performance was dramatic at least a 20 HP gain and a performance sound that was very noticeable. Only reason I removed it was I need to drive customers in my vehicle otherwise I would still have it installed!!! FREE SHIPPING FOR THE LOWER 48 STATES, NO INTERNATIONAL SALES!!! Sports Series 4" High Flow Catted Downpipe for the N20 (4 Cylinder) Engine Introducing the Sports Series 4" High Flow 200 Cell Metallic Catted Downpipes for your N20 four cylinder turbo engine! Fits all 2012+ 320i, 328i, 420i, 428i with the N20 engine (does not fit N26 engine). Key Features: Made in the USA! Manufactured in house. Now available for the 2012-15 BMW 328i/320i/428i/420i N20 Engines! High Flow 200 cell metallic catalytic converter used. Higher Max Horsepower Power Curve. Higher Initial Torque Curve. Torque curve hits faster and higher and longer. Better throttle response and faster turbo spool up times. Mandrel Bent 4" piping. Smooth transition to the exhaust system. 100% Stainless Steel Construction 100% TIG welded for better quality welds Precision CNC machined turbocharger V-Band flange. Stainless steel flex section like factory that allows proper exhaust movement and flexibility. Brush finish Compatible with the factory or aftermarket exhaust systems. Track tested durability. Restrictions in the exhaust system robs horsepower and torque especially on turbocharged cars. Thus, removing as much exhaust flow restrictions will increase horsepower and torque significantly. The factory catalytic converter found in the factory downpipe is a big culprit of this and is a major exhaust flow restriction. The factory catalytic converter is made up of catalyst material formed into "honeycomb" weaves. Exhaust gas must pass through these tiny "honeycomb" weaves on their way to the exhaust system thus causing a major exhaust flow restriction. It also causes turbulence after the catalytic converter which causes the exhaust flow to slow down (which increases restriction). By replacing the factory downpipe/catalytic converter with our Sports Series 4" High Flow Catted Downpipe, more power is unleashed! The factory catalytic uses a 400 cell ceramic core. What the 400 cells means is that per every inch, there are 400 "cells" that the exhaust gas must pass through. We use a 200 cell metallic core. By having less cells per square inch, these individual "cells" are bigger in size thus allowing exhaust gas to pass through it more easier. Thus, the lower the cell count, the higher the flow. Higher flow = more power, faster turbo spool up (less turbocharger lag) and better throttle response. Bottom line, faster. The benefits of a metallic catalytic converter vs a ceramic like the factory is that it can take more heat and is more durable (last longer). They are also lighter than their ceramic counterparts.

• Brand: BMW
• Type: Downpipe
• Features: 100% Accuracy of Fit
• Vintage Part: No
• Universal Fitment: No
• Placement on Vehicle: Exhaust