Armytrix High Performance Ceramic Coated Front Pipe Catalytic Converters because the factory boost mapping

because the factory boost mapping is very conservative in an attempt to keep the torque curve flat and the power delivery linear (which totally kills the feeling that you are driving a turbo

Comparable and can be used in place of factory tool #ST18355AA000

This is ideal when plumbing a custom high flow fuel system using an aftermarket regulator and custom fuel lines

Note: Mounting bases sit 26

So when it comes to keeping your engine cool and your E9X M3 running at its best

Armytrix High Performance Ceramic Coated Front Pipe Catalytic Converters because the factory boost mappingEnhance your vehicle by adding the ARMYTRIX exhaust system to increase power, reduce weight, and improve sound. This precision made performance system delivers more power, especially in the low and mid rev range, the effect on the sound is significant, adding a deep resonant sporty sound, but at the same time neutralizes the annoying frequencies in the most critical rpm range.