The only difference is that on a sc car the charger costs roughly 1500quid and the mounting kit costs another 1500quid or so.
You can buy the dpengineering kit for 2.5k which would still be cheaper then the charger and mounting kit or you could buy seperatly. A turbo around 800quid, home brew manifold + downpipe 500-800quid and water/oil lines around 200quid? a dumpvalve? 200-300quid. internal wastegate costs nothing.
but then you do need experience or have someone around whos good with a welder and someone close by to do a custom remap.
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208 GTI OwnerTurbo'd '6 project - work in progress