LOL dude, read more, learn more. The n75 is an ebc.
Yes it is... One that has a PID loop that doesn't work over 2550mbar absolute. How many of you guys tune past the MAP and drive your cars places with excessive density altitude changes on 91 octane?
The great thing about my MBC is that I never have overboost issues with air density changes... That means my tune is consistent whether it's in the 20's here or 120+ here. We see 100 degree temp swings in Arizona. I pin the throttle at 80 in 6th gear and I see the same boost regardless of the outside temp, or if I'm in California, etc.
If you leave the N249 working, throttling losses are not a problem because the bypass valves are open until the ECU requests boost.
Leave the N75 in place and cap it off.
To disable throttle cut for overboost, locate KFDLULS and FF the whole table.
That is of course unless somebody can prove you can use the N75 beyond the map limit and consistently control boost regardless of air density or engine load.