Sure you could do that at the cost of longevity and without the handling/safety of the GTI it won't be a fun/safe experience so not sure what you mean by "driving experience".
Of course the GTI with or without a tune will still leave it for dead, there's a reason why they offer the GTI as a package and not just an engine and that's the complete package of suspension, brakes, transmission, engine, wheels/tyres etc.
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