whats the most safest PSI you can push on the ECOtec with a turbo, And what Wideband would is good to have? Has anyone used the one That AEM makes? 

2004 Turbo cavalier 11PSI and blown!
 
 
i would say 6 plus fuel mods.  karo i think has a few deals on widebands too......
     
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- Sold my beloved J in April 2010 -