Feedback from my experience.

I sent my quite normal sounding (quiet) 5th gen Eaton M112 to the High Speed Lab to have them re coat the rotors and rebuild the blower itself.

The first time I sent it I was told it would be a one week turn around. 5 weeks later my blower arrived but it rattled far too noisily.

I sent it back and they did more work to it and it arrived back to me today. It sounds better, not dangerous, but still a little noisy, they said they did not know why it was Still making rattling noises.

They have offered for me to send it back again, but I've already been without my car for 2 precious summer months........maybe I'll just test out other things for a while and send it back in for service in the winter.

Why didnt you send it to Steigmeier?

I had Steig port it, but I use The High Speed Lab because they do the different rotor coatings that are immune to fuel for when I am injecting fuel/Nitrous before the blower.

If I had to do it over again, I would send it to Steig for the rebuild.


9/12/2013 update. The blower is somehow now quieter, definitely louder than with the rubber interference coating, still rattling, but not as much... I don't know what changed, I'll let it go as it is for a while and see how it behaves.