Different tuners will tune the cars slightly differently.
For example APR (which used to be big here in Aus) will hit the boost hard early and tail off towards redline. Whereas other tuners will be more linear and pull strongly to 6,000rpm.
I'm not sure what/if there's differences between the GTI software and that in the Tiguan, however it will probably take the tuners a little bit of time to develop Tiguan specific files. Hopefully it's not a complete rewrite and a lot of the development work that has already been done on other MQB platform cars can be lifted and used for the Tiguan.
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