We are going to seafoam Petey'* '92 SSEi this weekend when he comes up to do his LIM gaskets. Now my question is, where should we feed it in through? I kinda worry feeding it through a vacuum line before the rotors, since the seafoam could possibly get in the needle bearings and kill them? :?

The front vacuum tree that feeds the BCS is a good place.

i went through the brake boost line. (not sure if thats the same thing John said)

Ahh! I forgot that one.

The booster line will feed it through the rotors. The tree I mention is after the rotors. Downsides: close to one particular cylinder, could go right back through the wastegate anyway.

Seafoam?

Seafoam!
http://www.seafoamsales.com/motorTuneUpTechGas.htm

Ohhhhhhhh! OK! We use WYNNS at my job. But the Seafoam looks like good stuff!

Yeah it'* pretty effective. One of the few things that isn't "snake oil"

I would reccomend to disconnect the supercharger belt as you feed the seafoam in. The folks at GP club do that to protect the supercharger fins from getting their coating stripped.