Your car is a MSP. it does not need a Voltage clamp. See if you have the MSP dealer flash or you need some type of EMS. The SS afc is the best and most widely used.
i have a uni chip and jus had a steed speed exhaust manifold a single runner intake manifold and downpipe put on and at wot the boost is real choppy i still have the stock exahust so idk if thats part of the problem