If you are going to control closed loop fueling with the Megasquirt, i would really put the wideband in the downpipe, close to the stock o2location by the oil pan. It's not *imperative* that you do this, but it would be best to.

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
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-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)