The levers on the back are not levers, just vacuum ports for BOV , wastegate, FPR and APS sensor for the ecu. This manifold is designed to be used with a single 80mm TB.
The std manifold is good, but just because it has been used on 500bhp engines it doesn't mean it cannot be imporved.
4TB will increase trbolence in the runner, with the shaft, screws,plate being the cause. The plenum is too small in volume and the entry is too small too.
this manifold has been designed with the support of the best guy in head work in Italy and with the help of an engineer that works in the engine dept of Lamborghini.
I am considering organizing a group buy for them if there is enough interest.