Hi and welcome. Im from Newcastle so not too far from you. How has the 6R GTI treated you, because they have a woeful reliability track record? Hopefully you havent had too many issues with it.
The engine and transmission in the Tiguan 162TSI is MUCH more robust and reliable than the Polo. Although there have been instances of gearbox failures in the Tiguan and this is from the oil level being underfilled from the factory. So unless you know for sure that the gearbox has been serviced already, it might be worth having the oil level checked at a minimum, or replaced to make sure yours is ok.
As an alternative to the traditional IS38 turbo upgrade, there is also a Garrett Powermax turbo which is basically an IS38 competitor. I have a brand new one I am selling currently if you might be interested.
Info here if you wanted to have a look: Brand new Garrett Powermax Stage 1 turbo for MQB based Gen 3 EA888 engines
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