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Steeler · 07-20-2014, 05:51 PM

There should be 4 bungs on the header you have.
I used only 3 and plugged the 4th, the 3rd was for an AFR sensor.
Take note of which trio of cylinders goes to each of the stock pre cat sensors when you disconnect everything.
I labelled them precat front and precat rear when I did the swap.
Not sure if it matters but did not want to take any chances
Also label the post cat sensors for future reference.

07-20-2014, 05:51 PM	#9
Steeler Colonel 2429 Rep 2,704 Posts Drives: Built not Bought 04 Z4 VF Join Date: Feb 2013 Location: Kitchener Ontario Canada iTrader: (2)	There should be 4 bungs on the header you have. I used only 3 and plugged the 4th, the 3rd was for an AFR sensor. Take note of which trio of cylinders goes to each of the stock pre cat sensors when you disconnect everything. I labelled them precat front and precat rear when I did the swap. Not sure if it matters but did not want to take any chances Also label the post cat sensors for future reference. __________________ W2A Intercooled Vortech V3Si, custom ducting, Alpha N, 60# Bosch,2.62 pulley, multi port WMI, Severn Tuning(pokeybritches), Tial, magnaflow,SS race muffler, 42 design,3.91LSD, H&R, Hotchkis,ST coils,Konis, Megan camber arms, AKG SS, Nylon mounts, Poly bushings, Carbon interior, CF Aero.APEX
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