NNBS Bolt-on Performance?

It'll throw a code for the rear O2's, but it'll be alright to run it for a little while til you can get it tuned.
 
Giving this a bump since I went to the track today.

Here's my best pass of the day. All of the passes were within .2 seconds.
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Based on that, what numbers do you guys think I could realistically expect from LT Headers and a tune?