O2 sensor location

[Todd King]

     <<<
     On a home-built Turbo/EFI performance system using an aftermarket ECU,
     should the O2 sensor be located before the turbo or after ? If after 
     >>>
     
     Do like the oem's do- put it before the turbo. The stock loc on mine 
     is about 2" before the turbo.
     
     Todd       todd_king at ccm2.jf.intel.com