there's a bit of a write-up on scoobymods.
its a pain in the ass job. I did it with help from the local subie guys.
I just got the APS TGV deletes because they eliminate the bar that runs through the housing and comes with a mechanical CEL fix you can't get anywhere else. (as far as I'm concerened, if you can't get rid of that bar, its not worth doing).