I have a heavily modified B8.5 allroad that was flagged TD1 years ago. I had added an extended warranty (purchased through the dealership, platinum level) way back when I bought the car new. Fast forward to this year, and I'm out of original warranty by a few thousand miles and one of my injectors gets stuck open. Car gets towed to the dealership I have been using for repairs/maintenance from day 1 and was fixed on the extended warranty with zero hassle. Service advisor handled all the paperwork and payment of the $100 deductible.
What I learned here:
1. Extended warranty paperwork is seamless and handled by Audi service advisor
2. TD1 does not impact repairs in the same way it does with original warranty - TD1 does not equal immediate denial of powertrain repairs
3. Sometimes, a warranty rep will need to come to look at the car to approve the repairs (this didn't happen in my case) - can't say what would have happened had the warranty rep came out and observed the modified state of my car however
Another point I'll make is that I tuned my car almost immediately after getting it with a Stasis tune (through the dealer no less). At the time, Stasis was using Revo tunes and was the only tune available for E85 fuel compatible motors like I have. In my experience, the Stasis/Revo tune was subpar. acceleration and power delivery were uneven and there were surges here and there throughout. As soon as APR came out with their E85 tune I switched. There were a few hiccups getting the tune installed that APR and my local tuning shop eventually sorted out. It's been smooth sailing ever since with the injector being the only issue and not related to the tune/mods I've done.
So what does all this mean? IMO tuning is a relatively low risk with these cars/motor configurations. The 2.0T is a robust durable motor and used throughout the world. There is always going to be examples where things go haywire and any web search will turn these up. However, you could find examples of bone stock cars with issues as well.
One last point, with the stock tune I found the tip in point (the point when the car responded to my foot input on the accelerator) to be delayed. I actually found this to be dangerous! I'd hit the gas expecting the car to go and there would be a pause! Anyway, both tunes that I have run eliminated this problem completely. This is a side benefit of the various tunes, at least on my car's generation.
I say go for the tune, you'll love it.
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