I had a tdituning box on multiple cars until my
cupra (figured its mental enough). CRDT2 i think it was
Don't know whether they do one for yours (they have started doing turbo petrol models) but i found the difference was very noticeable when i had to take it off.
Doesn't invalidate your warranty unless you are daft enough not to remove it on service etc. I know this as my tdi mondeo broke and ford spent 3 days with it hooked up to the machines and did not spot anything untoward (though they also couldn't find why the car was going into limp home over 2000rpm either so maybe the systems aint all that...)
You must tell your insurance however.