Do I need LS1 edit?
As for the LS1 Edit tuning, unless you like looking at SES lights (because you now have no cats) then yes I would get it. Additionally, that GMAF has a tendency to lean out your engine. Some LS1 Edit tuning will be able to compensate for this and put your air/fuel ratio right on.
Gains with LS1 Edit: You may gain 20hp, you may gain nothing. It really depends on the car. If you are going LT's with no cats though, I would highly advise getting tuned.
Good Luck
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