BMW M3 E46 XperTune Performance Software 957 Turbo / Turbo S (2008-2010) these high-flow headers include HJS

these high-flow headers include HJS catalytic converters

Includes all required Hardware and Gaskets

I noticed that you offer two spring options

This system is a lot lighter than the factory system and flows much better

BMW M3 E46 XperTune Performance Software 957 Turbo / Turbo S (2008-2010) these high-flow headers include HJSHP: +22 TQ: +16 Achieve maximum power from the BMW M3 3. 2L straight six engine without sacrificing drivability or reliability by optimizing the engine's performance. Fabspeed Motorsport offers an alternative tuning method for vehicles equipped with ECU's that traditionally required bench flashing. No longer do you need to remove your ECU and mail it in for a tune. The Handheld device interfaces with the OBD II port on your vehicle and your computer