Chip use a balance pipe between the 4 TB's then a single pipe to a mapsensor,
This is how the GTR's work I have just mapped 1 with 1680cc Injectors with Autronic's Throttle/pressure mapping, Main fuel table TPS up to 100% then Boost pressure, Ignition table is map/pressure based,
I mapped this in 9 presses of the Accle to 2.2bar boost this system works floorless

Mark