Dont know about the performance gains i know for a fact that the DP will assist in air flow reducing lag and release heat.
the differences of the coolers lies inside the core. I have some picture that i need to find though is between the n20 and n55 coolers. The first has the fins in U shape rather narrow whilst the N55 fins are V shaped and broad.
BC= Boost pipe from turbo to cooler and CP= Charge pipe from cooler to the throttle.
That not a stage 2 but stage 1!!! i will pm you a tuner i know in sweden. If you look for Vded car has the same backbox, am N20 cooler and the DV+ @ 220hp and 320nm torque and thats stage 1....
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