Err it really depends on how you decide to play it
I'm somewhat in your same boat and this is how I think I will do it
EVO Wagner Intercooler - It apparently is plug&play and doesn't require cutting. Just keep the Stock Intercooler in garage and swap when ready to sell
200 Cell Downpipe - Same logic as above but the new owner get's a barely used stock downpipe. They all throw a CEL down the road so you're doing the future buyer a favour and can even use it in your advantage to play with the sale price, kinda
Tune - 2 Sensor or multi-sensor piggyback. Get a reputable/known brand. JB4 or Dinan. Either will have demand on the used market in the future.
In regard to warranty with this setup you don't need to worry. Install the tune yourself so that you're familiar with removing it when you have to take it for service or repair. Keep the valve's closed when inside the dealership and don't mention or boast about the car being tuned
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