My friend has the Viezu motorsport map on his Mk5 GTI. The motorsport map is the more powerful/agressive tune that Viezu offers. We had a bit of a "drag" yesterday and our cars were identical (rolling start - my car is manual Golf R with bluefin tune and intake, his GTI is a DSG with Viezu and intake.
It goes well and you can save yourself about $300-400 over the GIAC.
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