Well if your clutch is slipping this is a good replacement clutch. Its slightly better than the stock one. It doesnt add torque.
What the Pressure Plate does is put more clamping force on the clutch when your shifting. So lets say your racing this clutch and pressure plate will help you shifts get quicker and hold the power better than stock.
im no professional but thats basically the jitz of it.
Its a good upgrade from stock. With the same stock feel