Well, I got the E.D. o2 housing and high flow cat off ebay for $97, so I thought it was worth it. Besides, I'm going to have a shop do the install and fab up the 3" pipe for the downpipe w/high flow cat, so I'm not worried about the leak issue. I've got the plug wire set and socket that fit the NGK/AGP modified plugs, the same ones came with my Denso's, so I'm going to order them up to go with S1.
