Only issue with FP turbos is they hotside is generally very large and they don't spool well at all. If you DD this you might not be happy when full boost is about 5-5500RPM and only lasts for 1500RPM. Reasons for the DOMs are they are more appropriately sized for smaller engines like our EJs, the 2.5dom should boost around 4-4500RPM if you were still IWG. The 2.5L paired with the 1.5 and EWG should boost around 3500-4kRPM if your injectors can support it and you make use of your AVCS. Generally if you have EWG you can use a smaller hotside for better spool and still have good top end compared to IWG and a larger hotside (idk why I said the opposite in my last post).
For a DD with gobs of streetable power (not lagging past 4500RPM w/ 7k redline) I would highly recommend EWG with 8cm hotside, and at least the 1.5DOM. If 2.0L/1.5DOM are hitting full boost by 4k (EWG/Inj/8cm/no AVCS) then I'd say you should boost even sooner, but if you would rather have more highway fun, 10cm hotsides are what you'll want (especially if you do headwork down the road) just remember..larger hotsides spool later.
Numbers are just that, numbers. A mustang dyno is called a heartbreaker dyno for a reason, they show lower/truer numbers. What you need to remember is how soon you spool up and how long you can hold it SAFELY. FPs make big power late, at a lower cost. Do you want high numbers at the sacrifice of the low end powerband (430whp @5500RPM-7000RPM), or do you want 20-40 peak whp less but more power all around (390whp/390+wtq @3800RPM-6800RPM)?
Choose 2: Fast:Reliable:Cheap