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The difference between a catback and header custom tune that I saw was .2 A/Fs richer @ WOT.
So 2% richer is close if your target A/F is 12.5.
If you removed your cats too, I would go 3% richer.
 

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I feel like I recently responded to a post exactly like this lol deja vu.

Get a custom tune if your going to spend the money for long tubes. Seriously, 1k to 1,500 on a set of headers and you wont spend the extra 100 on a custom tune to get the most out of it?

You can only adjust WOT. Custom tunes can adjust part throttle too.
 
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