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I've had success with hammering a torx bit into them. About a t40 iirc.

Thanks very much :) I am actually trying to learn how to map it myself, have done a very basic tune for the AHU so far. Can anyone give me some feedback on my tune? My tune Original file Thanks.

I may have answered my own question, IMMO is in a separate chip so should not be a problem. I believe the camplate in the pump to be different in AHU to AFN. Will there be any issue running on standard AFN map to begin with? I will be fitting the .205 injectors from the AFN.

My current ECU is 028906021GM. AFN is 028906021GL. My understanding is that this is the same ECU with just different software. Is the IMMO located in the main H/L chips or elsewhere?

Hi all, I have an Audi A4 with a 90hp AHU engine. Have been doing lots of reading on the forum with regards to swapping over to VNT. I should be able to get all the parts fairly cheaply from an AFN Passat B5. Every conversion I've seen has had a custom tune to run the VNT. My question is...