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aFe POWER 48-46303-HN Twisted Steel Down-Pipe

BMW 328/428i (F30/32) 12-16 L4-2.0L (t) N20
Part Number: 48-46303-HN

MSRP: $594.00

In Stock. Will ship within 1-2 business days.


  • Race version for increased performance and a more aggressive sound
  • Constructed from 100% hand TIG-welded, 4" mandrel bent stainless steel tubing
  • Retains all factory O₂ locations for a hassle-free installation
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In Testing:
In house testing produced a max gain of +13 horsepower and +29 ft. lbs. of torque verified by our in house dyno.
Up to 287% increase in Flow

This aFe Power Race Down Pipe eliminates the catalytic converter for maximum exhaust flow for the popular 2012 BMW 328i with the N20 turbo motor. In recent dyno testing, this race pipe produced 13hp and 29lbs. x ft. torque and outflowed the factory down pipe by 287%. This system uses a 4" diameter tube and progressively tapers to increase exhaust velocity and usable torque. This high performance race pipe is constructed out of lightweight, TIG-welded 4" stainless steel.

100% TIG-Welded by certified craftsmen for race proven strength and durability. TIG-Welding provides the strongest welds reducing stress cracks.

Tapered Design:
 A unique 4" tapered design is used to increase exhaust velocity and increase usable torque. This means more aggressive throttle response and increased passing power. 

Factory O2 Sensor locations:
This down pipe uses factory mounting locations for the O2 sensors.

Hassle-Free Installation:
All hardware and brackets are included for a hassle-free installation. This unit also comes with a lifetime warranty.

This System Fits:
BMW N20, L4-2.0L (t)
2012-2016 F22, 228i/Xi
2014-2016 F23, 228i/Xi
2011-2016 F30/31, 320i/Xi & 328i/Xi
2015-2016 F30 LCI, 320i/Xi
2012-2016 F32/34, 328i/Xi & 428i/Xi
2013-2016 F33/36, 428i/Xi

Note 1: Does not fit vehicle with N26 engine.

Note 2: This is a "Race Only" product used solely for competition. Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization. Any other use including recreational off-road use could be in violation of local, state and federal laws. This system is not currently CARB exempt and is not available for sale in California or for use on any vehicle registered with the California Department of Motor Vehicle.

aFe down pipes are engineered and manufactured in our Corona, California manufacturing facility.


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