WEISTEC M157 / M278 Biturbo, High Flow Air FiltersThese Weistec filters are compatible with the 5. 5 Biturbo and the 4. 7 Biturbo (M157 and M278 engines). When analyzing the factory airbox and flow characteristics we found the placement of the filter in the box to be a significant restriction. Improvements in filter shape and positioning, combined with our very own high flow element provides a significant flow and power increase across all ranges of the engines power band. For maximum results, the

including MZ4

On our E46 version

1999-2006 S500

The ORIGINAL lightweight BMW spacer

See the RE RSM Assembly

an optional fuel pulse damper can be installed alternatively

This can prevent costly sheet metal damage "mushrooming" from potholes

The Rogue Engineering EGR Blockoff Plate (Exhaust Air Valve) blocks off the port on all S54

all of our E9X M3 pulley kit uses commonly available replacement aftermarket belts

2mm overall diameter

This is the same kit used on the 2007 Grand-Am GS Championship Automatic Racing M3s

right here in NJ