Were true ats 093 kits actually 3” dp? Ford definitely f#%*ed that up, if it fits, why run that tiny crushed pipe?.
Because it probably doesn't quite fit. I know the Banks 2.75" DP requires some "clearancing" of the firewall.
Also, with the HP level Ford was targeting, the extra restriction didn't mean much.
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OP, I'd suggest you look into adding a Wicked Wheel 2 to the kit while you have it out of the truck. It's $200, makes it spool faster and 15% better boost mid range.
It's not hard to install, and is pre-balanced.
(You'll find nay-sayers telling you that the whole turbo needs to be re-balanced, but that's not the impression I get from the WW2 makers. Nor does my turbo make any extra vibration or have any issues after installing mine).