it holds boost fine it has a low and high boost setting also you can turn it off to run whatever the wastegates are set at and it has a gain setting it is one of the simplest boost controllers out there and as an option you can get a button to put on your steering wheel to change between high and low boost settings on the fly also I got mine off of ebay for $250 and the button for $100 i am very happy with this boost controller and have no compaliants