aFe Twisted Steel Down Pipe Header RACE ONLY SS-304 12-16 BMW 328/428i L4 2.0L (t) N20

Testing:
In testing, the down-pipes produced a max gain of +13 horsepower and +29 ft. lbs. of torque verified by our in house dyno.

Race Version:
These down-pipes are designed as a "Race" version for added performance and a more aggressive sound.

Factory Mounting Locations:
The down-pipe mount directly to factory mounting locations and includes hardware for a hassle-free installation.

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 Style Connections:
Machined, factory style flanges are used for a secure leak-free seal.

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

Brushed 304 SS Construction:
This down-pipe are constructed of 4" mandrel-bent, brushed 304 stainless steel tubing for maximum performance, corrosion resistance and strength eliminating cracking.

This system requires an aftermarket electronic module to work properly with the vehicle.

All aFe exhaust systems are engineered and manufactured in our Corona, California facility.