collector extensions and improved ET'S

I have been reading on the subject here and there. I google something like"collector extension improved et", and start clicking on the results. most are from forums like ours.

There are some pretty interesting remarks out there about the subject. some guys saying they have picked up over a tenth by just putting on a set of collectors where they had none before.

I don't run any, but that's one thing that I had planned on doing to the car this winter. Just wondered what results or findings others in the Mopar community have had with them.