Had the DOF imsb done along with clutch right after getting the car a few weeks ago (along with brakes, ignition coils and aos). A couple days ago found an ln engineering imsr sticker inside the trunk hood. Sent it to ln to find out the the imsb had been replaced with the ln retro single row retrofit about 3.5 years ago. Turns out that they recommend replacing it every 4 years or 50k miles anyway so I would have had to do it next year (recommended) anyway. And since it needed a clutch anyhow I'm glad I did it.
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