O2 sensors and a crossover

hotrdd

XS650 Junkie
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After a bunch of shipping errors I ended up with 2 free Innovative MTX-L air/fuel gauges that I am going to install for a bit on the bike. I'm also thinking of putting a crossover on the pipes but have a few questions first.

http://www.innovatemotorsports.com/products/MTXL.php

1) Should I put the cross over in first and then tune with the gauges or try it without first?

2) Does it matter if the O2 sensor is on the top side or bottom of the exhaust pipe near the engine?

3) How far down the pipes, or from the engine should the crossover be? How large of a crossover?
 
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