The Accels fit both the primaries and the secondaries. Marc Haibeck swears by them, I was just over at his shop last week. He also confirmed that they are stainless steel.
The bypass is relatively simple. Just undo the coolant hoses that go to either side of the throttle housing. Remove the hoses and run a single hose from one coolant line to the other under the front of the plenum.
I'll snap a picture of mine and post it so you can see.
Hans
