Any luck with O2 extenders (NO CEL)

[TRAC WPN]

I am considering the lethal performance off road pipes, but only way I will pull the trigger is if I can avoid a CEL with an O2 extender i.e http://www.ebay.com/itm/O2-oxygen-s...ash=item4174af4288:g:RwQAAMXQMmJROrN3&vxp=mtr

Searching the forum I saw some eco boost and GT guys having some luck with these, any one try it yet in a gt350?

Tune is not an option.
Thanks

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