Yes, TBH when I tune with either catted car or a non catted car I go from my Wideband AFR and just call it quits,, probe in pre Cat or exhuast I just shoot for a safe target, probably the same as your tuner ;-)
Like I said I would not worry, looks a smooth enough taper to redline.
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Boosted V8 hunter
2850 lbs and 375WHP
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