[Toivo]

I have unheated sensors in the collectors.

Only use one for the ECM.

I believe in symetry (sp?) though, so there's one for each bank.

Seems to work fine and I always have a spare.

Reading down the posts, I should also say I'm using Tri-Y headers which are relatively short, but it's still a ways down to the collector, just not quite as far down as with long-tube headers. And it does seem to work fine there, in fact I have fairly low correction factors (and only allow +-10% max anyway) of 1,2 or 3% +-.

You asked for actual experiences