I know the HPT bypass only connected one of the two cables going into security module so assume this is a "Single Pass" unit Have seen statements of "Double Pass" units and is what AlfaOBD told me I had to have. I could not get a return confirmation when changing tire size from the BCM module. Sent message to Alfa saying wouldn't work. They recomended SGWlink bypass from Zautomotive. Noticed right off had both cables from secutity module connect to bypass. No connection at all to stock module.
Was nice that made HPT ABS Initialize command work after installing new bypass.