I have a bosch MAF and Manual. Can i just buy a used 1mb box and flash it to a M-box and do a immo off? Or do i have to change more like the MAF?
Yes, you can flash it to an mbox.
551M has no immo
Yes, you have to copy bosch MLOFS and MLHFM
You will also likely need to recode the ECU to 06611 (no ESP)