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Old 04-18-2012, 10:33 AM   #5
hassmaschine
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Join Date: Sep 2011
Location: Ferndale, WA
Posts: 198
My Ride: '91 325ix
tunes don't really "adapt" - the closed loop O2 operation will bring your fuel back to the lambda targets, but ignition timing is really what gets optimized for power on an OBDII engine and that will remain fixed no matter the mods.

but, they're mostly all canned tunes anyway, so it really won't make a difference if you do it first or last. me, I'd do it first.
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