I was given this car from a friend. 207,000 miles

its has code p0299 Underboost
& p0420 Bank 1

i have replaced the turbo, Diverter valve, n75 valve, boost sensori have done a smoke test. From that I replaced a check valve with a hole in it and my intake to turbo tube had a hole. Which is now replaced.

I STILL Have the same 2 dumb codes. Running out of ideas

clogged cat? MAF Sensor? New engine haha