What is this, does it work?

It looks like a switched, 10k ICP resistor (variable though) mod. Pretty priceyif that's what it is. The 10k mod is posted all over the place here and on Steve Baz's website. I don't think you'll see anywhere near those increases on a 94-97 PSD. Cheers!

I think someone posted numbers for the 10k mod before, but I can't recall what the increase might be. You can go to the link for Baz's site above and find the 10k mod instructions. That'll only cost about a buck! Slightly more if you add a switch and potentiometer to vary the resistance. Cheers!