There was a lot of good discussion of welding techniques in the "Bolts" thread.
I'm probably going to add a second bung to my exhaust system (R1150RT) so that I can run both a stock O2 sensor and my wideband O2 sensor side-by-side. I don't know any welders in the Metrowest Boston area nor do I know what I'm looking for--skills, equipment, etc.
Does anyone have a recommendation of a welder in my area who does neat work or could you point out what I would need to ask? Also, does anyone have any thought on where I should locate a second sensor (I would only use the mount temporarily?