Those automotive ECUs often use NEXUS trace to load and extract cal data, and emulate cal data. Can do things like overlay/ redirect certain memory regions using the nexus probe Probably locked down tho after its been released. If you have to ask the price, they probably won't sell it to you, and will be confused why you aren't an automotive oem. (I worked on a MPC5777M for a project, which is kinda in the same family as the MPC5674 (marked SPC5674 on the package) but never used the NEXUS probe).
NXP does sell the jtag probe and has an IDE for the series... but it'll be locked.