Sorry, I somehow wasn't subscribed to this thread? or missed my name, sorry. We use the corvette regulator/filters. We have found that aftermarkets aren't up to the task. They sometimes wear out, or don't hold pressure where as the GM units, we never...ever... have issues with them. I have Had a recent discussion with Aeromotive about this, and they claim they do see issues related to theses "type" filters...but then the extra part of the conversation where it would be discovered if it's a GM filter, or an autozone filter, doesn't seem to happen.