The oems including ford would never push these cars to the extent we have...8-10 psi is quite normal for factory boosted cars...maybe you are new to turbos but all previous factory turbo cars left plenty on the table and pretty much any car I can think with a factory turbo had another 80 horse power in it.
It's the same reason wrx doesn't come with 400 hp, Toyota supras didn't have 400hp, Acura RDX doesn't have 380hp, gti don't have 320, Mazda speed3 don't have 380...should I go on?...all of those are realistic crank hp goals from increasing the boost on stock turbos.
The oems Aren't into pushing fuel systems and transmissions and chassis to the max for the sake of a few boy racers.
350hp , 10:1 compression , plenty of torque, seats 5 ,4400lbs , all weather performance, and 25 mpg highway all on 87 octane...not bad...don't think they left too much on the table for the average guy
Now have your 450hp ...you need premium fuel . Mpg will suffer a little and fuel system is heavily taxed and running at full bore with your average 3 bar tune, running torque levels that exceed what the 6f55 is rated for and people complaining of wheel hop and axle and tranny damage...yep ford left a lot on the table and is stupid lol...come on
