SteveHobart 57 Posted October 7, 2018 Hey guys! So I want to chip my XF EFI Manual and I am told a J3 won’t be compatiable with the XF ECU. So I have a EL ECU and complete wiring loom. As I understand it, I can connect a few inputs only to the EL ECU and then instal a J3 chip and tune it a little more aggressively. My question is, what inputs need to go where? When I bypass the XF ecu for the above, can I continue using the XF ECU and loom for the balance? Thanks Sent from my iPhone using Tapatalk Share this post Link to post Share on other sites